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Finding the Fourth Proportional to 479.18, 661.16 and 282.76

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Solution

The fourth proportional to 479.18, 661.16 and 282.76 is: 390.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.18 : 661.16 = 282.76 : x
  2. Step 2: Convert to fraction form
    479.18/661.16 = 282.76/x
  3. Step 3: Cross multiply
    479.18x = 661.16 × 282.76
  4. Step 4: Simplify right side
    479.18x = 186,948.66
  5. Step 5: Solve for x
    x = 186,948.66/479.18
  6. Step 6: Final answer
    x = 390.14

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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.