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Finding the Fourth Proportional to 9,128, 13,693.08 and 2,972

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Solution

The fourth proportional to 9,128, 13,693.08 and 2,972 is: 4,458.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,128 : 13,693.08 = 2,972 : x
  2. Step 2: Convert to fraction form
    9,128/13,693.08 = 2,972/x
  3. Step 3: Cross multiply
    9,128x = 13,693.08 × 2,972
  4. Step 4: Simplify right side
    9,128x = 40,695,833.76
  5. Step 5: Solve for x
    x = 40,695,833.76/9,128
  6. Step 6: Final answer
    x = 4,458.35

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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.