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Finding the Fourth Proportional to 478.76, 660.72 and 282.28

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Solution

The fourth proportional to 478.76, 660.72 and 282.28 is: 389.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.76 : 660.72 = 282.28 : x
  2. Step 2: Convert to fraction form
    478.76/660.72 = 282.28/x
  3. Step 3: Cross multiply
    478.76x = 660.72 × 282.28
  4. Step 4: Simplify right side
    478.76x = 186,508.04
  5. Step 5: Solve for x
    x = 186,508.04/478.76
  6. Step 6: Final answer
    x = 389.56

Related Problems

Find fourth proportional to 239.38, 330.36 and 141.14
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Double scale
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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.