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Finding the Fourth Proportional to 660,695.40, 991,043.10 and 572,121.90

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Solution

The fourth proportional to 660,695.40, 991,043.10 and 572,121.90 is: 858,182.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,695.40 : 991,043.10 = 572,121.90 : x
  2. Step 2: Convert to fraction form
    660,695.40/991,043.10 = 572,121.90/x
  3. Step 3: Cross multiply
    660,695.40x = 991,043.10 × 572,121.90
  4. Step 4: Simplify right side
    660,695.40x = 566,997,461,353.89
  5. Step 5: Solve for x
    x = 566,997,461,353.89/660,695.40
  6. Step 6: Final answer
    x = 858,182.85

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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.