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Finding the Fourth Proportional to 15,121.79, 20,868.84 and 8,407.55

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Solution

The fourth proportional to 15,121.79, 20,868.84 and 8,407.55 is: 11,602.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.79 : 20,868.84 = 8,407.55 : x
  2. Step 2: Convert to fraction form
    15,121.79/20,868.84 = 8,407.55/x
  3. Step 3: Cross multiply
    15,121.79x = 20,868.84 × 8,407.55
  4. Step 4: Simplify right side
    15,121.79x = 175,455,750.53
  5. Step 5: Solve for x
    x = 175,455,750.53/15,121.79
  6. Step 6: Final answer
    x = 11,602.84

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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.