Home / 100,348.89-138,378.09-70,123.20

Finding the Fourth Proportional to 100,348.89, 138,378.09 and 70,123.20

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Solution

The fourth proportional to 100,348.89, 138,378.09 and 70,123.20 is: 96,697.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,348.89 : 138,378.09 = 70,123.20 : x
  2. Step 2: Convert to fraction form
    100,348.89/138,378.09 = 70,123.20/x
  3. Step 3: Cross multiply
    100,348.89x = 138,378.09 × 70,123.20
  4. Step 4: Simplify right side
    100,348.89x = 9,703,514,480.69
  5. Step 5: Solve for x
    x = 9,703,514,480.69/100,348.89
  6. Step 6: Final answer
    x = 96,697.78

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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.