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Finding the Fourth Proportional to 9,188.72, 12,681 and 5,209.76

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Solution

The fourth proportional to 9,188.72, 12,681 and 5,209.76 is: 7,189.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,188.72 : 12,681 = 5,209.76 : x
  2. Step 2: Convert to fraction form
    9,188.72/12,681 = 5,209.76/x
  3. Step 3: Cross multiply
    9,188.72x = 12,681 × 5,209.76
  4. Step 4: Simplify right side
    9,188.72x = 66,064,966.56
  5. Step 5: Solve for x
    x = 66,064,966.56/9,188.72
  6. Step 6: Final answer
    x = 7,189.79

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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.