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Finding the Fourth Proportional to 66,462.80, 99,809.40 and 64,389.20

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Solution

The fourth proportional to 66,462.80, 99,809.40 and 64,389.20 is: 96,695.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,462.80 : 99,809.40 = 64,389.20 : x
  2. Step 2: Convert to fraction form
    66,462.80/99,809.40 = 64,389.20/x
  3. Step 3: Cross multiply
    66,462.80x = 99,809.40 × 64,389.20
  4. Step 4: Simplify right side
    66,462.80x = 6,426,647,418.48
  5. Step 5: Solve for x
    x = 6,426,647,418.48/66,462.80
  6. Step 6: Final answer
    x = 96,695.41

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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.