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Finding the Fourth Proportional to 66,073.62, 91,055.70 and 64,859

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Solution

The fourth proportional to 66,073.62, 91,055.70 and 64,859 is: 89,381.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,073.62 : 91,055.70 = 64,859 : x
  2. Step 2: Convert to fraction form
    66,073.62/91,055.70 = 64,859/x
  3. Step 3: Cross multiply
    66,073.62x = 91,055.70 × 64,859
  4. Step 4: Simplify right side
    66,073.62x = 5,905,781,646.30
  5. Step 5: Solve for x
    x = 5,905,781,646.30/66,073.62
  6. Step 6: Final answer
    x = 89,381.84

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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.