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Finding the Fourth Proportional to 458,553.32, 687,189.26 and 390,731.21

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Solution

The fourth proportional to 458,553.32, 687,189.26 and 390,731.21 is: 585,550.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,553.32 : 687,189.26 = 390,731.21 : x
  2. Step 2: Convert to fraction form
    458,553.32/687,189.26 = 390,731.21/x
  3. Step 3: Cross multiply
    458,553.32x = 687,189.26 × 390,731.21
  4. Step 4: Simplify right side
    458,553.32x = 268,506,288,599.69
  5. Step 5: Solve for x
    x = 268,506,288,599.69/458,553.32
  6. Step 6: Final answer
    x = 585,550.86

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1.5x scale

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.