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Finding the Fourth Proportional to 438,326.60, 657,489.90 and 428,485.10

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Solution

The fourth proportional to 438,326.60, 657,489.90 and 428,485.10 is: 642,727.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,326.60 : 657,489.90 = 428,485.10 : x
  2. Step 2: Convert to fraction form
    438,326.60/657,489.90 = 428,485.10/x
  3. Step 3: Cross multiply
    438,326.60x = 657,489.90 × 428,485.10
  4. Step 4: Simplify right side
    438,326.60x = 281,724,625,550.49
  5. Step 5: Solve for x
    x = 281,724,625,550.49/438,326.60
  6. Step 6: Final answer
    x = 642,727.65

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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.