Home / 100,721.16-138,988.40-57,700.80

Finding the Fourth Proportional to 100,721.16, 138,988.40 and 57,700.80

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Solution

The fourth proportional to 100,721.16, 138,988.40 and 57,700.80 is: 79,623.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,721.16 : 138,988.40 = 57,700.80 : x
  2. Step 2: Convert to fraction form
    100,721.16/138,988.40 = 57,700.80/x
  3. Step 3: Cross multiply
    100,721.16x = 138,988.40 × 57,700.80
  4. Step 4: Simplify right side
    100,721.16x = 8,019,741,870.72
  5. Step 5: Solve for x
    x = 8,019,741,870.72/100,721.16
  6. Step 6: Final answer
    x = 79,623.21

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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.