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Finding the Fourth Proportional to 390,077.10, 585,115.65 and 322,425.90

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Solution

The fourth proportional to 390,077.10, 585,115.65 and 322,425.90 is: 483,638.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,077.10 : 585,115.65 = 322,425.90 : x
  2. Step 2: Convert to fraction form
    390,077.10/585,115.65 = 322,425.90/x
  3. Step 3: Cross multiply
    390,077.10x = 585,115.65 × 322,425.90
  4. Step 4: Simplify right side
    390,077.10x = 188,656,440,055.34
  5. Step 5: Solve for x
    x = 188,656,440,055.34/390,077.10
  6. Step 6: Final answer
    x = 483,638.85

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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.