Home / 20,915.87-31,373.84-8,904.92

Finding the Fourth Proportional to 20,915.87, 31,373.84 and 8,904.92

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Solution

The fourth proportional to 20,915.87, 31,373.84 and 8,904.92 is: 13,357.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.87 : 31,373.84 = 8,904.92 : x
  2. Step 2: Convert to fraction form
    20,915.87/31,373.84 = 8,904.92/x
  3. Step 3: Cross multiply
    20,915.87x = 31,373.84 × 8,904.92
  4. Step 4: Simplify right side
    20,915.87x = 279,381,333.90
  5. Step 5: Solve for x
    x = 279,381,333.90/20,915.87
  6. Step 6: Final answer
    x = 13,357.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.