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Finding the Fourth Proportional to 816.32, 1,126.12 and 521.48

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Solution

The fourth proportional to 816.32, 1,126.12 and 521.48 is: 719.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.32 : 1,126.12 = 521.48 : x
  2. Step 2: Convert to fraction form
    816.32/1,126.12 = 521.48/x
  3. Step 3: Cross multiply
    816.32x = 1,126.12 × 521.48
  4. Step 4: Simplify right side
    816.32x = 587,249.06
  5. Step 5: Solve for x
    x = 587,249.06/816.32
  6. Step 6: Final answer
    x = 719.39

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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.