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Finding the Fourth Proportional to 1,177.16, 1,765.76 and 311.47

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Solution

The fourth proportional to 1,177.16, 1,765.76 and 311.47 is: 467.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,177.16 : 1,765.76 = 311.47 : x
  2. Step 2: Convert to fraction form
    1,177.16/1,765.76 = 311.47/x
  3. Step 3: Cross multiply
    1,177.16x = 1,765.76 × 311.47
  4. Step 4: Simplify right side
    1,177.16x = 549,981.27
  5. Step 5: Solve for x
    x = 549,981.27/1,177.16
  6. Step 6: Final answer
    x = 467.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.