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Finding the Fourth Proportional to 478.95, 661.05 and 282.51

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Solution

The fourth proportional to 478.95, 661.05 and 282.51 is: 389.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.95 : 661.05 = 282.51 : x
  2. Step 2: Convert to fraction form
    478.95/661.05 = 282.51/x
  3. Step 3: Cross multiply
    478.95x = 661.05 × 282.51
  4. Step 4: Simplify right side
    478.95x = 186,753.24
  5. Step 5: Solve for x
    x = 186,753.24/478.95
  6. Step 6: Final answer
    x = 389.92

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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.