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Finding the Fourth Proportional to 69,218.40, 103,762.80 and 54,217.20

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Solution

The fourth proportional to 69,218.40, 103,762.80 and 54,217.20 is: 81,275.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,218.40 : 103,762.80 = 54,217.20 : x
  2. Step 2: Convert to fraction form
    69,218.40/103,762.80 = 54,217.20/x
  3. Step 3: Cross multiply
    69,218.40x = 103,762.80 × 54,217.20
  4. Step 4: Simplify right side
    69,218.40x = 5,625,728,480.16
  5. Step 5: Solve for x
    x = 5,625,728,480.16/69,218.40
  6. Step 6: Final answer
    x = 81,275.04

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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.