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Finding the Fourth Proportional to 13,811.93, 20,712.71 and 5,915.15

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Solution

The fourth proportional to 13,811.93, 20,712.71 and 5,915.15 is: 8,870.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,811.93 : 20,712.71 = 5,915.15 : x
  2. Step 2: Convert to fraction form
    13,811.93/20,712.71 = 5,915.15/x
  3. Step 3: Cross multiply
    13,811.93x = 20,712.71 × 5,915.15
  4. Step 4: Simplify right side
    13,811.93x = 122,518,833.71
  5. Step 5: Solve for x
    x = 122,518,833.71/13,811.93
  6. Step 6: Final answer
    x = 8,870.51

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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.