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Finding the Fourth Proportional to 8,915.85, 13,369.23 and 2,990.70

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Solution

The fourth proportional to 8,915.85, 13,369.23 and 2,990.70 is: 4,484.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,915.85 : 13,369.23 = 2,990.70 : x
  2. Step 2: Convert to fraction form
    8,915.85/13,369.23 = 2,990.70/x
  3. Step 3: Cross multiply
    8,915.85x = 13,369.23 × 2,990.70
  4. Step 4: Simplify right side
    8,915.85x = 39,983,356.16
  5. Step 5: Solve for x
    x = 39,983,356.16/8,915.85
  6. Step 6: Final answer
    x = 4,484.53

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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.