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Finding the Fourth Proportional to 478.99, 661.06 and 282.57

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Solution

The fourth proportional to 478.99, 661.06 and 282.57 is: 389.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.99 : 661.06 = 282.57 : x
  2. Step 2: Convert to fraction form
    478.99/661.06 = 282.57/x
  3. Step 3: Cross multiply
    478.99x = 661.06 × 282.57
  4. Step 4: Simplify right side
    478.99x = 186,795.72
  5. Step 5: Solve for x
    x = 186,795.72/478.99
  6. Step 6: Final answer
    x = 389.98

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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.