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Finding the Fourth Proportional to 390,649.12, 585,779.76 and 124,375

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Solution

The fourth proportional to 390,649.12, 585,779.76 and 124,375 is: 186,500.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,649.12 : 585,779.76 = 124,375 : x
  2. Step 2: Convert to fraction form
    390,649.12/585,779.76 = 124,375/x
  3. Step 3: Cross multiply
    390,649.12x = 585,779.76 × 124,375
  4. Step 4: Simplify right side
    390,649.12x = 72,856,357,650
  5. Step 5: Solve for x
    x = 72,856,357,650/390,649.12
  6. Step 6: Final answer
    x = 186,500.76

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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.