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Finding the Fourth Proportional to 66,300.72, 99,451.51 and 18,915.71

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Solution

The fourth proportional to 66,300.72, 99,451.51 and 18,915.71 is: 28,373.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,300.72 : 99,451.51 = 18,915.71 : x
  2. Step 2: Convert to fraction form
    66,300.72/99,451.51 = 18,915.71/x
  3. Step 3: Cross multiply
    66,300.72x = 99,451.51 × 18,915.71
  4. Step 4: Simplify right side
    66,300.72x = 1,881,195,484.08
  5. Step 5: Solve for x
    x = 1,881,195,484.08/66,300.72
  6. Step 6: Final answer
    x = 28,373.68

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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.