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Finding the Fourth Proportional to 765.12, 1,146.56 and 490.56

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Solution

The fourth proportional to 765.12, 1,146.56 and 490.56 is: 735.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.12 : 1,146.56 = 490.56 : x
  2. Step 2: Convert to fraction form
    765.12/1,146.56 = 490.56/x
  3. Step 3: Cross multiply
    765.12x = 1,146.56 × 490.56
  4. Step 4: Simplify right side
    765.12x = 562,456.47
  5. Step 5: Solve for x
    x = 562,456.47/765.12
  6. Step 6: Final answer
    x = 735.12

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Double scale
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1.5x scale

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.