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Finding the Fourth Proportional to 457,725.40, 687,365.70 and 339,530.20

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Solution

The fourth proportional to 457,725.40, 687,365.70 and 339,530.20 is: 509,872.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,725.40 : 687,365.70 = 339,530.20 : x
  2. Step 2: Convert to fraction form
    457,725.40/687,365.70 = 339,530.20/x
  3. Step 3: Cross multiply
    457,725.40x = 687,365.70 × 339,530.20
  4. Step 4: Simplify right side
    457,725.40x = 233,381,413,594.14
  5. Step 5: Solve for x
    x = 233,381,413,594.14/457,725.40
  6. Step 6: Final answer
    x = 509,872.11

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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.