Home / 679,967.40-1,020,104.70-399,340.20

Finding the Fourth Proportional to 679,967.40, 1,020,104.70 and 399,340.20

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Solution

The fourth proportional to 679,967.40, 1,020,104.70 and 399,340.20 is: 599,100.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,967.40 : 1,020,104.70 = 399,340.20 : x
  2. Step 2: Convert to fraction form
    679,967.40/1,020,104.70 = 399,340.20/x
  3. Step 3: Cross multiply
    679,967.40x = 1,020,104.70 × 399,340.20
  4. Step 4: Simplify right side
    679,967.40x = 407,368,814,918.94
  5. Step 5: Solve for x
    x = 407,368,814,918.94/679,967.40
  6. Step 6: Final answer
    x = 599,100.51

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Double scale
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Similar ratio
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1.5x scale

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.