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Finding the Fourth Proportional to 638.40, 880.88 and 417.66

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Solution

The fourth proportional to 638.40, 880.88 and 417.66 is: 576.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.40 : 880.88 = 417.66 : x
  2. Step 2: Convert to fraction form
    638.40/880.88 = 417.66/x
  3. Step 3: Cross multiply
    638.40x = 880.88 × 417.66
  4. Step 4: Simplify right side
    638.40x = 367,908.34
  5. Step 5: Solve for x
    x = 367,908.34/638.40
  6. Step 6: Final answer
    x = 576.30

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1.5x scale

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.