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Finding the Fourth Proportional to 458,542.08, 687,172.50 and 390,719.88

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Solution

The fourth proportional to 458,542.08, 687,172.50 and 390,719.88 is: 585,533.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,542.08 : 687,172.50 = 390,719.88 : x
  2. Step 2: Convert to fraction form
    458,542.08/687,172.50 = 390,719.88/x
  3. Step 3: Cross multiply
    458,542.08x = 687,172.50 × 390,719.88
  4. Step 4: Simplify right side
    458,542.08x = 268,491,956,739.30
  5. Step 5: Solve for x
    x = 268,491,956,739.30/458,542.08
  6. Step 6: Final answer
    x = 585,533.95

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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.