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Finding the Fourth Proportional to 391,288.35, 542,740.51 and 380,917.87

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Solution

The fourth proportional to 391,288.35, 542,740.51 and 380,917.87 is: 528,356.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,288.35 : 542,740.51 = 380,917.87 : x
  2. Step 2: Convert to fraction form
    391,288.35/542,740.51 = 380,917.87/x
  3. Step 3: Cross multiply
    391,288.35x = 542,740.51 × 380,917.87
  4. Step 4: Simplify right side
    391,288.35x = 206,739,559,031.91
  5. Step 5: Solve for x
    x = 206,739,559,031.91/391,288.35
  6. Step 6: Final answer
    x = 528,356.03

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.