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Finding the Fourth Proportional to 66,240.32, 99,372.64 and 21,870.08

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Solution

The fourth proportional to 66,240.32, 99,372.64 and 21,870.08 is: 32,809.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,240.32 : 99,372.64 = 21,870.08 : x
  2. Step 2: Convert to fraction form
    66,240.32/99,372.64 = 21,870.08/x
  3. Step 3: Cross multiply
    66,240.32x = 99,372.64 × 21,870.08
  4. Step 4: Simplify right side
    66,240.32x = 2,173,287,586.61
  5. Step 5: Solve for x
    x = 2,173,287,586.61/66,240.32
  6. Step 6: Final answer
    x = 32,809.13

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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.