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Finding the Fourth Proportional to 458,543.08, 687,174 and 390,720.88

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Solution

The fourth proportional to 458,543.08, 687,174 and 390,720.88 is: 585,535.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,543.08 : 687,174 = 390,720.88 : x
  2. Step 2: Convert to fraction form
    458,543.08/687,174 = 390,720.88/x
  3. Step 3: Cross multiply
    458,543.08x = 687,174 × 390,720.88
  4. Step 4: Simplify right side
    458,543.08x = 268,493,229,993.12
  5. Step 5: Solve for x
    x = 268,493,229,993.12/458,543.08
  6. Step 6: Final answer
    x = 585,535.45

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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.