Home / 20,872.29-28,831.37-15,557.88

Finding the Fourth Proportional to 20,872.29, 28,831.37 and 15,557.88

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Solution

The fourth proportional to 20,872.29, 28,831.37 and 15,557.88 is: 21,490.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.29 : 28,831.37 = 15,557.88 : x
  2. Step 2: Convert to fraction form
    20,872.29/28,831.37 = 15,557.88/x
  3. Step 3: Cross multiply
    20,872.29x = 28,831.37 × 15,557.88
  4. Step 4: Simplify right side
    20,872.29x = 448,554,916.91
  5. Step 5: Solve for x
    x = 448,554,916.91/20,872.29
  6. Step 6: Final answer
    x = 21,490.45

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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.