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Finding the Fourth Proportional to 66,428.76, 91,619.84 and 42,557.65

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Solution

The fourth proportional to 66,428.76, 91,619.84 and 42,557.65 is: 58,696.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,428.76 : 91,619.84 = 42,557.65 : x
  2. Step 2: Convert to fraction form
    66,428.76/91,619.84 = 42,557.65/x
  3. Step 3: Cross multiply
    66,428.76x = 91,619.84 × 42,557.65
  4. Step 4: Simplify right side
    66,428.76x = 3,899,125,190.17
  5. Step 5: Solve for x
    x = 3,899,125,190.17/66,428.76
  6. Step 6: Final answer
    x = 58,696.35

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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.