Home / 1,287,135.40-1,930,703.10-989,120.20

Finding the Fourth Proportional to 1,287,135.40, 1,930,703.10 and 989,120.20

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Solution

The fourth proportional to 1,287,135.40, 1,930,703.10 and 989,120.20 is: 1,483,680.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,135.40 : 1,930,703.10 = 989,120.20 : x
  2. Step 2: Convert to fraction form
    1,287,135.40/1,930,703.10 = 989,120.20/x
  3. Step 3: Cross multiply
    1,287,135.40x = 1,930,703.10 × 989,120.20
  4. Step 4: Simplify right side
    1,287,135.40x = 1,909,697,436,412.62
  5. Step 5: Solve for x
    x = 1,909,697,436,412.62/1,287,135.40
  6. Step 6: Final answer
    x = 1,483,680.30

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Double scale
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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.