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Finding the Fourth Proportional to 572,139.04, 789,811.68 and 391,144

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Solution

The fourth proportional to 572,139.04, 789,811.68 and 391,144 is: 539,956.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    572,139.04 : 789,811.68 = 391,144 : x
  2. Step 2: Convert to fraction form
    572,139.04/789,811.68 = 391,144/x
  3. Step 3: Cross multiply
    572,139.04x = 789,811.68 × 391,144
  4. Step 4: Simplify right side
    572,139.04x = 308,930,099,761.92
  5. Step 5: Solve for x
    x = 308,930,099,761.92/572,139.04
  6. Step 6: Final answer
    x = 539,956.34

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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.