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Finding the Fourth Proportional to 66,130.60, 99,138.30 and 39,807.40

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Solution

The fourth proportional to 66,130.60, 99,138.30 and 39,807.40 is: 59,676.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,130.60 : 99,138.30 = 39,807.40 : x
  2. Step 2: Convert to fraction form
    66,130.60/99,138.30 = 39,807.40/x
  3. Step 3: Cross multiply
    66,130.60x = 99,138.30 × 39,807.40
  4. Step 4: Simplify right side
    66,130.60x = 3,946,437,963.42
  5. Step 5: Solve for x
    x = 3,946,437,963.42/66,130.60
  6. Step 6: Final answer
    x = 59,676.43

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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.