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Finding the Fourth Proportional to 47,985.60, 71,978.40 and 43,392.90

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Solution

The fourth proportional to 47,985.60, 71,978.40 and 43,392.90 is: 65,089.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,985.60 : 71,978.40 = 43,392.90 : x
  2. Step 2: Convert to fraction form
    47,985.60/71,978.40 = 43,392.90/x
  3. Step 3: Cross multiply
    47,985.60x = 71,978.40 × 43,392.90
  4. Step 4: Simplify right side
    47,985.60x = 3,123,351,513.36
  5. Step 5: Solve for x
    x = 3,123,351,513.36/47,985.60
  6. Step 6: Final answer
    x = 65,089.35

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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.