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Finding the Fourth Proportional to 66,807, 92,207.70 and 61,420.91

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Solution

The fourth proportional to 66,807, 92,207.70 and 61,420.91 is: 84,773.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,807 : 92,207.70 = 61,420.91 : x
  2. Step 2: Convert to fraction form
    66,807/92,207.70 = 61,420.91/x
  3. Step 3: Cross multiply
    66,807x = 92,207.70 × 61,420.91
  4. Step 4: Simplify right side
    66,807x = 5,663,480,381.97
  5. Step 5: Solve for x
    x = 5,663,480,381.97/66,807
  6. Step 6: Final answer
    x = 84,773.76

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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.