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Finding the Fourth Proportional to 478.99, 661.25 and 282.56

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Solution

The fourth proportional to 478.99, 661.25 and 282.56 is: 390.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.99 : 661.25 = 282.56 : x
  2. Step 2: Convert to fraction form
    478.99/661.25 = 282.56/x
  3. Step 3: Cross multiply
    478.99x = 661.25 × 282.56
  4. Step 4: Simplify right side
    478.99x = 186,841.39
  5. Step 5: Solve for x
    x = 186,841.39/478.99
  6. Step 6: Final answer
    x = 390.08

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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.