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Finding the Fourth Proportional to 66,564.28, 91,858.76 and 42,690.88

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Solution

The fourth proportional to 66,564.28, 91,858.76 and 42,690.88 is: 58,913.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,564.28 : 91,858.76 = 42,690.88 : x
  2. Step 2: Convert to fraction form
    66,564.28/91,858.76 = 42,690.88/x
  3. Step 3: Cross multiply
    66,564.28x = 91,858.76 × 42,690.88
  4. Step 4: Simplify right side
    66,564.28x = 3,921,531,300.11
  5. Step 5: Solve for x
    x = 3,921,531,300.11/66,564.28
  6. Step 6: Final answer
    x = 58,913.45

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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.