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Finding the Fourth Proportional to 611,603.10, 917,404.65 and 485,631.90

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Solution

The fourth proportional to 611,603.10, 917,404.65 and 485,631.90 is: 728,447.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,603.10 : 917,404.65 = 485,631.90 : x
  2. Step 2: Convert to fraction form
    611,603.10/917,404.65 = 485,631.90/x
  3. Step 3: Cross multiply
    611,603.10x = 917,404.65 × 485,631.90
  4. Step 4: Simplify right side
    611,603.10x = 445,520,963,248.34
  5. Step 5: Solve for x
    x = 445,520,963,248.34/611,603.10
  6. Step 6: Final answer
    x = 728,447.85

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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.