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Finding the Fourth Proportional to 66,931.13, 92,311.72 and 56,892.80

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Solution

The fourth proportional to 66,931.13, 92,311.72 and 56,892.80 is: 78,466.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,931.13 : 92,311.72 = 56,892.80 : x
  2. Step 2: Convert to fraction form
    66,931.13/92,311.72 = 56,892.80/x
  3. Step 3: Cross multiply
    66,931.13x = 92,311.72 × 56,892.80
  4. Step 4: Simplify right side
    66,931.13x = 5,251,872,312.16
  5. Step 5: Solve for x
    x = 5,251,872,312.16/66,931.13
  6. Step 6: Final answer
    x = 78,466.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.