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Finding the Fourth Proportional to 100,359.41, 138,502.10 and 57,920.67

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Solution

The fourth proportional to 100,359.41, 138,502.10 and 57,920.67 is: 79,934.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,359.41 : 138,502.10 = 57,920.67 : x
  2. Step 2: Convert to fraction form
    100,359.41/138,502.10 = 57,920.67/x
  3. Step 3: Cross multiply
    100,359.41x = 138,502.10 × 57,920.67
  4. Step 4: Simplify right side
    100,359.41x = 8,022,134,573.21
  5. Step 5: Solve for x
    x = 8,022,134,573.21/100,359.41
  6. Step 6: Final answer
    x = 79,934.06

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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.