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Finding the Fourth Proportional to 66,428.63, 91,619.67 and 42,557.53

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Solution

The fourth proportional to 66,428.63, 91,619.67 and 42,557.53 is: 58,696.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,428.63 : 91,619.67 = 42,557.53 : x
  2. Step 2: Convert to fraction form
    66,428.63/91,619.67 = 42,557.53/x
  3. Step 3: Cross multiply
    66,428.63x = 91,619.67 × 42,557.53
  4. Step 4: Simplify right side
    66,428.63x = 3,899,106,396.52
  5. Step 5: Solve for x
    x = 3,899,106,396.52/66,428.63
  6. Step 6: Final answer
    x = 58,696.17

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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.