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Finding the Fourth Proportional to 391,248.48, 539,920.08 and 221,481.12

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Solution

The fourth proportional to 391,248.48, 539,920.08 and 221,481.12 is: 305,642.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,248.48 : 539,920.08 = 221,481.12 : x
  2. Step 2: Convert to fraction form
    391,248.48/539,920.08 = 221,481.12/x
  3. Step 3: Cross multiply
    391,248.48x = 539,920.08 × 221,481.12
  4. Step 4: Simplify right side
    391,248.48x = 119,582,104,028.89
  5. Step 5: Solve for x
    x = 119,582,104,028.89/391,248.48
  6. Step 6: Final answer
    x = 305,642.35

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1.5x scale

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.