Home / 1,287,123.40-1,930,685.10-989,108.20

Finding the Fourth Proportional to 1,287,123.40, 1,930,685.10 and 989,108.20

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Solution

The fourth proportional to 1,287,123.40, 1,930,685.10 and 989,108.20 is: 1,483,662.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,123.40 : 1,930,685.10 = 989,108.20 : x
  2. Step 2: Convert to fraction form
    1,287,123.40/1,930,685.10 = 989,108.20/x
  3. Step 3: Cross multiply
    1,287,123.40x = 1,930,685.10 × 989,108.20
  4. Step 4: Simplify right side
    1,287,123.40x = 1,909,656,464,027.82
  5. Step 5: Solve for x
    x = 1,909,656,464,027.82/1,287,123.40
  6. Step 6: Final answer
    x = 1,483,662.30

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Double scale
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Similar ratio
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.