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Finding the Fourth Proportional to 390,960.90, 586,452.30 and 138,205.68

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Solution

The fourth proportional to 390,960.90, 586,452.30 and 138,205.68 is: 207,312.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,960.90 : 586,452.30 = 138,205.68 : x
  2. Step 2: Convert to fraction form
    390,960.90/586,452.30 = 138,205.68/x
  3. Step 3: Cross multiply
    390,960.90x = 586,452.30 × 138,205.68
  4. Step 4: Simplify right side
    390,960.90x = 81,051,038,909.06
  5. Step 5: Solve for x
    x = 81,051,038,909.06/390,960.90
  6. Step 6: Final answer
    x = 207,312.39

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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.