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Finding the Fourth Proportional to 265,389.38, 398,151.50 and 78,400.88

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Solution

The fourth proportional to 265,389.38, 398,151.50 and 78,400.88 is: 117,621.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,389.38 : 398,151.50 = 78,400.88 : x
  2. Step 2: Convert to fraction form
    265,389.38/398,151.50 = 78,400.88/x
  3. Step 3: Cross multiply
    265,389.38x = 398,151.50 × 78,400.88
  4. Step 4: Simplify right side
    265,389.38x = 31,215,425,590.56
  5. Step 5: Solve for x
    x = 31,215,425,590.56/265,389.38
  6. Step 6: Final answer
    x = 117,621.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.