Home / 15,645.86-21,585.29-9,980.82

Finding the Fourth Proportional to 15,645.86, 21,585.29 and 9,980.82

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Solution

The fourth proportional to 15,645.86, 21,585.29 and 9,980.82 is: 13,769.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,645.86 : 21,585.29 = 9,980.82 : x
  2. Step 2: Convert to fraction form
    15,645.86/21,585.29 = 9,980.82/x
  3. Step 3: Cross multiply
    15,645.86x = 21,585.29 × 9,980.82
  4. Step 4: Simplify right side
    15,645.86x = 215,438,844.23
  5. Step 5: Solve for x
    x = 215,438,844.23/15,645.86
  6. Step 6: Final answer
    x = 13,769.70

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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.