Home / 15,505.79-21,398.48-8,791.70

Finding the Fourth Proportional to 15,505.79, 21,398.48 and 8,791.70

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Solution

The fourth proportional to 15,505.79, 21,398.48 and 8,791.70 is: 12,132.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,505.79 : 21,398.48 = 8,791.70 : x
  2. Step 2: Convert to fraction form
    15,505.79/21,398.48 = 8,791.70/x
  3. Step 3: Cross multiply
    15,505.79x = 21,398.48 × 8,791.70
  4. Step 4: Simplify right side
    15,505.79x = 188,129,026.15
  5. Step 5: Solve for x
    x = 188,129,026.15/15,505.79
  6. Step 6: Final answer
    x = 12,132.82

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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.