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Finding the Fourth Proportional to 12,915.90, 19,337.40 and 12,551.40

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Solution

The fourth proportional to 12,915.90, 19,337.40 and 12,551.40 is: 18,791.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,915.90 : 19,337.40 = 12,551.40 : x
  2. Step 2: Convert to fraction form
    12,915.90/19,337.40 = 12,551.40/x
  3. Step 3: Cross multiply
    12,915.90x = 19,337.40 × 12,551.40
  4. Step 4: Simplify right side
    12,915.90x = 242,711,442.36
  5. Step 5: Solve for x
    x = 242,711,442.36/12,915.90
  6. Step 6: Final answer
    x = 18,791.68

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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.