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Finding the Fourth Proportional to 390,645.48, 539,101.38 and 220,905

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Solution

The fourth proportional to 390,645.48, 539,101.38 and 220,905 is: 304,854.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,645.48 : 539,101.38 = 220,905 : x
  2. Step 2: Convert to fraction form
    390,645.48/539,101.38 = 220,905/x
  3. Step 3: Cross multiply
    390,645.48x = 539,101.38 × 220,905
  4. Step 4: Simplify right side
    390,645.48x = 119,090,190,348.90
  5. Step 5: Solve for x
    x = 119,090,190,348.90/390,645.48
  6. Step 6: Final answer
    x = 304,854.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.