Home / 20,931.86-31,521.60-15,129.02

Finding the Fourth Proportional to 20,931.86, 31,521.60 and 15,129.02

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Solution

The fourth proportional to 20,931.86, 31,521.60 and 15,129.02 is: 22,783.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.86 : 31,521.60 = 15,129.02 : x
  2. Step 2: Convert to fraction form
    20,931.86/31,521.60 = 15,129.02/x
  3. Step 3: Cross multiply
    20,931.86x = 31,521.60 × 15,129.02
  4. Step 4: Simplify right side
    20,931.86x = 476,890,916.83
  5. Step 5: Solve for x
    x = 476,890,916.83/20,931.86
  6. Step 6: Final answer
    x = 22,783.02

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.