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Finding the Fourth Proportional to 447, 616.80 and 260.40

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Solution

The fourth proportional to 447, 616.80 and 260.40 is: 359.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    447 : 616.80 = 260.40 : x
  2. Step 2: Convert to fraction form
    447/616.80 = 260.40/x
  3. Step 3: Cross multiply
    447x = 616.80 × 260.40
  4. Step 4: Simplify right side
    447x = 160,614.72
  5. Step 5: Solve for x
    x = 160,614.72/447
  6. Step 6: Final answer
    x = 359.32

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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.