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Finding the Fourth Proportional to 70,686.80, 105,888.64 and 42,591.20

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Solution

The fourth proportional to 70,686.80, 105,888.64 and 42,591.20 is: 63,801.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,686.80 : 105,888.64 = 42,591.20 : x
  2. Step 2: Convert to fraction form
    70,686.80/105,888.64 = 42,591.20/x
  3. Step 3: Cross multiply
    70,686.80x = 105,888.64 × 42,591.20
  4. Step 4: Simplify right side
    70,686.80x = 4,509,924,243.97
  5. Step 5: Solve for x
    x = 4,509,924,243.97/70,686.80
  6. Step 6: Final answer
    x = 63,801.51

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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.