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Finding the Fourth Proportional to 390,038.20, 585,167.46 and 109,557.88

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Solution

The fourth proportional to 390,038.20, 585,167.46 and 109,557.88 is: 164,367.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,038.20 : 585,167.46 = 109,557.88 : x
  2. Step 2: Convert to fraction form
    390,038.20/585,167.46 = 109,557.88/x
  3. Step 3: Cross multiply
    390,038.20x = 585,167.46 × 109,557.88
  4. Step 4: Simplify right side
    390,038.20x = 64,109,706,362.58
  5. Step 5: Solve for x
    x = 64,109,706,362.58/390,038.20
  6. Step 6: Final answer
    x = 164,367.76

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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.