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Finding the Fourth Proportional to 485,557.40, 728,117.40 and 185,938.40

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Solution

The fourth proportional to 485,557.40, 728,117.40 and 185,938.40 is: 278,823.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,557.40 : 728,117.40 = 185,938.40 : x
  2. Step 2: Convert to fraction form
    485,557.40/728,117.40 = 185,938.40/x
  3. Step 3: Cross multiply
    485,557.40x = 728,117.40 × 185,938.40
  4. Step 4: Simplify right side
    485,557.40x = 135,384,984,368.16
  5. Step 5: Solve for x
    x = 135,384,984,368.16/485,557.40
  6. Step 6: Final answer
    x = 278,823.85

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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.