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Finding the Fourth Proportional to 66,013.84, 91,060.08 and 42,140.52

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Solution

The fourth proportional to 66,013.84, 91,060.08 and 42,140.52 is: 58,129.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,013.84 : 91,060.08 = 42,140.52 : x
  2. Step 2: Convert to fraction form
    66,013.84/91,060.08 = 42,140.52/x
  3. Step 3: Cross multiply
    66,013.84x = 91,060.08 × 42,140.52
  4. Step 4: Simplify right side
    66,013.84x = 3,837,318,964.41
  5. Step 5: Solve for x
    x = 3,837,318,964.41/66,013.84
  6. Step 6: Final answer
    x = 58,129.01

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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.