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Finding the Fourth Proportional to 457,872.40, 686,805.36 and 142,328.80

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Solution

The fourth proportional to 457,872.40, 686,805.36 and 142,328.80 is: 213,492.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,872.40 : 686,805.36 = 142,328.80 : x
  2. Step 2: Convert to fraction form
    457,872.40/686,805.36 = 142,328.80/x
  3. Step 3: Cross multiply
    457,872.40x = 686,805.36 × 142,328.80
  4. Step 4: Simplify right side
    457,872.40x = 97,752,182,722.37
  5. Step 5: Solve for x
    x = 97,752,182,722.37/457,872.40
  6. Step 6: Final answer
    x = 213,492.19

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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.