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Finding the Fourth Proportional to 66,421.20, 99,631.80 and 59,860.20

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Solution

The fourth proportional to 66,421.20, 99,631.80 and 59,860.20 is: 89,790.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,421.20 : 99,631.80 = 59,860.20 : x
  2. Step 2: Convert to fraction form
    66,421.20/99,631.80 = 59,860.20/x
  3. Step 3: Cross multiply
    66,421.20x = 99,631.80 × 59,860.20
  4. Step 4: Simplify right side
    66,421.20x = 5,963,979,474.36
  5. Step 5: Solve for x
    x = 5,963,979,474.36/66,421.20
  6. Step 6: Final answer
    x = 89,790.30

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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.