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Finding the Fourth Proportional to 390,843.21, 585,620.85 and 358,159.71

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Solution

The fourth proportional to 390,843.21, 585,620.85 and 358,159.71 is: 536,649.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,843.21 : 585,620.85 = 358,159.71 : x
  2. Step 2: Convert to fraction form
    390,843.21/585,620.85 = 358,159.71/x
  3. Step 3: Cross multiply
    390,843.21x = 585,620.85 × 358,159.71
  4. Step 4: Simplify right side
    390,843.21x = 209,745,793,805.95
  5. Step 5: Solve for x
    x = 209,745,793,805.95/390,843.21
  6. Step 6: Final answer
    x = 536,649.45

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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.