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Finding the Fourth Proportional to 5,515, 7,617.20 and 3,648.76

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Solution

The fourth proportional to 5,515, 7,617.20 and 3,648.76 is: 5,039.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,515 : 7,617.20 = 3,648.76 : x
  2. Step 2: Convert to fraction form
    5,515/7,617.20 = 3,648.76/x
  3. Step 3: Cross multiply
    5,515x = 7,617.20 × 3,648.76
  4. Step 4: Simplify right side
    5,515x = 27,793,334.67
  5. Step 5: Solve for x
    x = 27,793,334.67/5,515
  6. Step 6: Final answer
    x = 5,039.59

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Half scale
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Double scale
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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.