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Finding the Fourth Proportional to 8,611.92, 12,915.45 and 4,915.89

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Solution

The fourth proportional to 8,611.92, 12,915.45 and 4,915.89 is: 7,372.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.92 : 12,915.45 = 4,915.89 : x
  2. Step 2: Convert to fraction form
    8,611.92/12,915.45 = 4,915.89/x
  3. Step 3: Cross multiply
    8,611.92x = 12,915.45 × 4,915.89
  4. Step 4: Simplify right side
    8,611.92x = 63,490,931.50
  5. Step 5: Solve for x
    x = 63,490,931.50/8,611.92
  6. Step 6: Final answer
    x = 7,372.45

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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.