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Finding the Fourth Proportional to 9,347.86, 12,900 and 5,156.11

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Solution

The fourth proportional to 9,347.86, 12,900 and 5,156.11 is: 7,115.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,347.86 : 12,900 = 5,156.11 : x
  2. Step 2: Convert to fraction form
    9,347.86/12,900 = 5,156.11/x
  3. Step 3: Cross multiply
    9,347.86x = 12,900 × 5,156.11
  4. Step 4: Simplify right side
    9,347.86x = 66,513,819.00
  5. Step 5: Solve for x
    x = 66,513,819.00/9,347.86
  6. Step 6: Final answer
    x = 7,115.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.