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Finding the Fourth Proportional to 485,364.60, 728,046.90 and 438,125.40

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Solution

The fourth proportional to 485,364.60, 728,046.90 and 438,125.40 is: 657,188.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,364.60 : 728,046.90 = 438,125.40 : x
  2. Step 2: Convert to fraction form
    485,364.60/728,046.90 = 438,125.40/x
  3. Step 3: Cross multiply
    485,364.60x = 728,046.90 × 438,125.40
  4. Step 4: Simplify right side
    485,364.60x = 318,975,839,281.26
  5. Step 5: Solve for x
    x = 318,975,839,281.26/485,364.60
  6. Step 6: Final answer
    x = 657,188.10

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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.