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Finding the Fourth Proportional to 391,156.29, 539,703.14 and 221,390.42

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Solution

The fourth proportional to 391,156.29, 539,703.14 and 221,390.42 is: 305,466.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,156.29 : 539,703.14 = 221,390.42 : x
  2. Step 2: Convert to fraction form
    391,156.29/539,703.14 = 221,390.42/x
  3. Step 3: Cross multiply
    391,156.29x = 539,703.14 × 221,390.42
  4. Step 4: Simplify right side
    391,156.29x = 119,485,101,034.45
  5. Step 5: Solve for x
    x = 119,485,101,034.45/391,156.29
  6. Step 6: Final answer
    x = 305,466.39

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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.