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Finding the Fourth Proportional to 816.90, 1,127.37 and 462.85

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Solution

The fourth proportional to 816.90, 1,127.37 and 462.85 is: 638.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.90 : 1,127.37 = 462.85 : x
  2. Step 2: Convert to fraction form
    816.90/1,127.37 = 462.85/x
  3. Step 3: Cross multiply
    816.90x = 1,127.37 × 462.85
  4. Step 4: Simplify right side
    816.90x = 521,803.20
  5. Step 5: Solve for x
    x = 521,803.20/816.90
  6. Step 6: Final answer
    x = 638.76

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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.