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Finding the Fourth Proportional to 869,342.40, 1,304,402.40 and 308,779.20

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Solution

The fourth proportional to 869,342.40, 1,304,402.40 and 308,779.20 is: 463,306.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    869,342.40 : 1,304,402.40 = 308,779.20 : x
  2. Step 2: Convert to fraction form
    869,342.40/1,304,402.40 = 308,779.20/x
  3. Step 3: Cross multiply
    869,342.40x = 1,304,402.40 × 308,779.20
  4. Step 4: Simplify right side
    869,342.40x = 402,772,329,550.08
  5. Step 5: Solve for x
    x = 402,772,329,550.08/869,342.40
  6. Step 6: Final answer
    x = 463,306.90

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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.