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Finding the Fourth Proportional to 15,989.40, 22,064.40 and 8,915.40

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Solution

The fourth proportional to 15,989.40, 22,064.40 and 8,915.40 is: 12,302.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,989.40 : 22,064.40 = 8,915.40 : x
  2. Step 2: Convert to fraction form
    15,989.40/22,064.40 = 8,915.40/x
  3. Step 3: Cross multiply
    15,989.40x = 22,064.40 × 8,915.40
  4. Step 4: Simplify right side
    15,989.40x = 196,712,951.76
  5. Step 5: Solve for x
    x = 196,712,951.76/15,989.40
  6. Step 6: Final answer
    x = 12,302.71

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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.