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Finding the Fourth Proportional to 867.78, 1,197.51 and 474.79

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Solution

The fourth proportional to 867.78, 1,197.51 and 474.79 is: 655.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.78 : 1,197.51 = 474.79 : x
  2. Step 2: Convert to fraction form
    867.78/1,197.51 = 474.79/x
  3. Step 3: Cross multiply
    867.78x = 1,197.51 × 474.79
  4. Step 4: Simplify right side
    867.78x = 568,565.77
  5. Step 5: Solve for x
    x = 568,565.77/867.78
  6. Step 6: Final answer
    x = 655.20

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Double scale
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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.