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Finding the Fourth Proportional to 848.72, 1,171.26 and 638.56

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Solution

The fourth proportional to 848.72, 1,171.26 and 638.56 is: 881.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    848.72 : 1,171.26 = 638.56 : x
  2. Step 2: Convert to fraction form
    848.72/1,171.26 = 638.56/x
  3. Step 3: Cross multiply
    848.72x = 1,171.26 × 638.56
  4. Step 4: Simplify right side
    848.72x = 747,919.79
  5. Step 5: Solve for x
    x = 747,919.79/848.72
  6. Step 6: Final answer
    x = 881.23

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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.