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Finding the Fourth Proportional to 12,390.78, 17,098.14 and 7,354.14

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Solution

The fourth proportional to 12,390.78, 17,098.14 and 7,354.14 is: 10,148.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.78 : 17,098.14 = 7,354.14 : x
  2. Step 2: Convert to fraction form
    12,390.78/17,098.14 = 7,354.14/x
  3. Step 3: Cross multiply
    12,390.78x = 17,098.14 × 7,354.14
  4. Step 4: Simplify right side
    12,390.78x = 125,742,115.30
  5. Step 5: Solve for x
    x = 125,742,115.30/12,390.78
  6. Step 6: Final answer
    x = 10,148.04

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1.5x scale

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.