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Finding the Fourth Proportional to 66,428.70, 99,643.05 and 42,927.90

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Solution

The fourth proportional to 66,428.70, 99,643.05 and 42,927.90 is: 64,391.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,428.70 : 99,643.05 = 42,927.90 : x
  2. Step 2: Convert to fraction form
    66,428.70/99,643.05 = 42,927.90/x
  3. Step 3: Cross multiply
    66,428.70x = 99,643.05 × 42,927.90
  4. Step 4: Simplify right side
    66,428.70x = 4,277,466,886.10
  5. Step 5: Solve for x
    x = 4,277,466,886.10/66,428.70
  6. Step 6: Final answer
    x = 64,391.85

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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.