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Finding the Fourth Proportional to 874.52, 1,205.10 and 638.08

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Solution

The fourth proportional to 874.52, 1,205.10 and 638.08 is: 879.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.52 : 1,205.10 = 638.08 : x
  2. Step 2: Convert to fraction form
    874.52/1,205.10 = 638.08/x
  3. Step 3: Cross multiply
    874.52x = 1,205.10 × 638.08
  4. Step 4: Simplify right side
    874.52x = 768,950.21
  5. Step 5: Solve for x
    x = 768,950.21/874.52
  6. Step 6: Final answer
    x = 879.28

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Double scale
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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.