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Finding the Fourth Proportional to 391,020.64, 539,692.88 and 238,109.56

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Solution

The fourth proportional to 391,020.64, 539,692.88 and 238,109.56 is: 328,642.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,020.64 : 539,692.88 = 238,109.56 : x
  2. Step 2: Convert to fraction form
    391,020.64/539,692.88 = 238,109.56/x
  3. Step 3: Cross multiply
    391,020.64x = 539,692.88 × 238,109.56
  4. Step 4: Simplify right side
    391,020.64x = 128,506,034,191.93
  5. Step 5: Solve for x
    x = 128,506,034,191.93/391,020.64
  6. Step 6: Final answer
    x = 328,642.59

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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.