Home / 21,061.54-31,431.12-18,815.16

Finding the Fourth Proportional to 21,061.54, 31,431.12 and 18,815.16

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Solution

The fourth proportional to 21,061.54, 31,431.12 and 18,815.16 is: 28,078.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,061.54 : 31,431.12 = 18,815.16 : x
  2. Step 2: Convert to fraction form
    21,061.54/31,431.12 = 18,815.16/x
  3. Step 3: Cross multiply
    21,061.54x = 31,431.12 × 18,815.16
  4. Step 4: Simplify right side
    21,061.54x = 591,381,551.78
  5. Step 5: Solve for x
    x = 591,381,551.78/21,061.54
  6. Step 6: Final answer
    x = 28,078.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.