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Finding the Fourth Proportional to 8,470, 12,700.36 and 2,920.24

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Solution

The fourth proportional to 8,470, 12,700.36 and 2,920.24 is: 4,378.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,470 : 12,700.36 = 2,920.24 : x
  2. Step 2: Convert to fraction form
    8,470/12,700.36 = 2,920.24/x
  3. Step 3: Cross multiply
    8,470x = 12,700.36 × 2,920.24
  4. Step 4: Simplify right side
    8,470x = 37,088,099.29
  5. Step 5: Solve for x
    x = 37,088,099.29/8,470
  6. Step 6: Final answer
    x = 4,378.76

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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.