Home / 20,990.16-28,966.36-11,558.72

Finding the Fourth Proportional to 20,990.16, 28,966.36 and 11,558.72

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Solution

The fourth proportional to 20,990.16, 28,966.36 and 11,558.72 is: 15,951.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.16 : 28,966.36 = 11,558.72 : x
  2. Step 2: Convert to fraction form
    20,990.16/28,966.36 = 11,558.72/x
  3. Step 3: Cross multiply
    20,990.16x = 28,966.36 × 11,558.72
  4. Step 4: Simplify right side
    20,990.16x = 334,814,044.66
  5. Step 5: Solve for x
    x = 334,814,044.66/20,990.16
  6. Step 6: Final answer
    x = 15,951.00

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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.