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Finding the Fourth Proportional to 66,130.80, 99,205.92 and 21,749.28

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Solution

The fourth proportional to 66,130.80, 99,205.92 and 21,749.28 is: 32,627.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,130.80 : 99,205.92 = 21,749.28 : x
  2. Step 2: Convert to fraction form
    66,130.80/99,205.92 = 21,749.28/x
  3. Step 3: Cross multiply
    66,130.80x = 99,205.92 × 21,749.28
  4. Step 4: Simplify right side
    66,130.80x = 2,157,657,331.74
  5. Step 5: Solve for x
    x = 2,157,657,331.74/66,130.80
  6. Step 6: Final answer
    x = 32,627.12

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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.