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Finding the Fourth Proportional to 867.76, 1,197.10 and 518.42

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Solution

The fourth proportional to 867.76, 1,197.10 and 518.42 is: 715.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.76 : 1,197.10 = 518.42 : x
  2. Step 2: Convert to fraction form
    867.76/1,197.10 = 518.42/x
  3. Step 3: Cross multiply
    867.76x = 1,197.10 × 518.42
  4. Step 4: Simplify right side
    867.76x = 620,600.58
  5. Step 5: Solve for x
    x = 620,600.58/867.76
  6. Step 6: Final answer
    x = 715.18

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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.