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Finding the Fourth Proportional to 391,111.76, 539,657.16 and 238,108.88

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Solution

The fourth proportional to 391,111.76, 539,657.16 and 238,108.88 is: 328,543.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,111.76 : 539,657.16 = 238,108.88 : x
  2. Step 2: Convert to fraction form
    391,111.76/539,657.16 = 238,108.88/x
  3. Step 3: Cross multiply
    391,111.76x = 539,657.16 × 238,108.88
  4. Step 4: Simplify right side
    391,111.76x = 128,497,161,951.58
  5. Step 5: Solve for x
    x = 128,497,161,951.58/391,111.76
  6. Step 6: Final answer
    x = 328,543.33

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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.