Home / 99,805.28-137,726.45-56,780.72

Finding the Fourth Proportional to 99,805.28, 137,726.45 and 56,780.72

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Solution

The fourth proportional to 99,805.28, 137,726.45 and 56,780.72 is: 78,354.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,805.28 : 137,726.45 = 56,780.72 : x
  2. Step 2: Convert to fraction form
    99,805.28/137,726.45 = 56,780.72/x
  3. Step 3: Cross multiply
    99,805.28x = 137,726.45 × 56,780.72
  4. Step 4: Simplify right side
    99,805.28x = 7,820,206,994.04
  5. Step 5: Solve for x
    x = 7,820,206,994.04/99,805.28
  6. Step 6: Final answer
    x = 78,354.64

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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.