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Finding the Fourth Proportional to 4,650, 6,975 and 1,187.28

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Solution

The fourth proportional to 4,650, 6,975 and 1,187.28 is: 1,780.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,650 : 6,975 = 1,187.28 : x
  2. Step 2: Convert to fraction form
    4,650/6,975 = 1,187.28/x
  3. Step 3: Cross multiply
    4,650x = 6,975 × 1,187.28
  4. Step 4: Simplify right side
    4,650x = 8,281,278
  5. Step 5: Solve for x
    x = 8,281,278/4,650
  6. Step 6: Final answer
    x = 1,780.92

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Double scale
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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.