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Finding the Fourth Proportional to 12,937.40, 19,407.90 and 5,144.40

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Solution

The fourth proportional to 12,937.40, 19,407.90 and 5,144.40 is: 7,717.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,937.40 : 19,407.90 = 5,144.40 : x
  2. Step 2: Convert to fraction form
    12,937.40/19,407.90 = 5,144.40/x
  3. Step 3: Cross multiply
    12,937.40x = 19,407.90 × 5,144.40
  4. Step 4: Simplify right side
    12,937.40x = 99,842,000.76
  5. Step 5: Solve for x
    x = 99,842,000.76/12,937.40
  6. Step 6: Final answer
    x = 7,717.32

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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.