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Finding the Fourth Proportional to 72,691.20, 109,036.80 and 56,944.80

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Solution

The fourth proportional to 72,691.20, 109,036.80 and 56,944.80 is: 85,417.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,691.20 : 109,036.80 = 56,944.80 : x
  2. Step 2: Convert to fraction form
    72,691.20/109,036.80 = 56,944.80/x
  3. Step 3: Cross multiply
    72,691.20x = 109,036.80 × 56,944.80
  4. Step 4: Simplify right side
    72,691.20x = 6,209,078,768.64
  5. Step 5: Solve for x
    x = 6,209,078,768.64/72,691.20
  6. Step 6: Final answer
    x = 85,417.20

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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.