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Finding the Fourth Proportional to 18,765.54, 28,159.25 and 7,670.57

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Solution

The fourth proportional to 18,765.54, 28,159.25 and 7,670.57 is: 11,510.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.54 : 28,159.25 = 7,670.57 : x
  2. Step 2: Convert to fraction form
    18,765.54/28,159.25 = 7,670.57/x
  3. Step 3: Cross multiply
    18,765.54x = 28,159.25 × 7,670.57
  4. Step 4: Simplify right side
    18,765.54x = 215,997,319.12
  5. Step 5: Solve for x
    x = 215,997,319.12/18,765.54
  6. Step 6: Final answer
    x = 11,510.32

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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.