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Finding the Fourth Proportional to 914.68, 1,380.13 and 874.72

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Solution

The fourth proportional to 914.68, 1,380.13 and 874.72 is: 1,319.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.68 : 1,380.13 = 874.72 : x
  2. Step 2: Convert to fraction form
    914.68/1,380.13 = 874.72/x
  3. Step 3: Cross multiply
    914.68x = 1,380.13 × 874.72
  4. Step 4: Simplify right side
    914.68x = 1,207,227.31
  5. Step 5: Solve for x
    x = 1,207,227.31/914.68
  6. Step 6: Final answer
    x = 1,319.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.