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Finding the Fourth Proportional to 66,607.57, 91,935.20 and 42,775.80

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Solution

The fourth proportional to 66,607.57, 91,935.20 and 42,775.80 is: 59,041.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,607.57 : 91,935.20 = 42,775.80 : x
  2. Step 2: Convert to fraction form
    66,607.57/91,935.20 = 42,775.80/x
  3. Step 3: Cross multiply
    66,607.57x = 91,935.20 × 42,775.80
  4. Step 4: Simplify right side
    66,607.57x = 3,932,601,490.34
  5. Step 5: Solve for x
    x = 3,932,601,490.34/66,607.57
  6. Step 6: Final answer
    x = 59,041.36

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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.