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Finding the Fourth Proportional to 816.14, 1,125.24 and 553.70

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Solution

The fourth proportional to 816.14, 1,125.24 and 553.70 is: 763.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.14 : 1,125.24 = 553.70 : x
  2. Step 2: Convert to fraction form
    816.14/1,125.24 = 553.70/x
  3. Step 3: Cross multiply
    816.14x = 1,125.24 × 553.70
  4. Step 4: Simplify right side
    816.14x = 623,039.76
  5. Step 5: Solve for x
    x = 623,039.76/816.14
  6. Step 6: Final answer
    x = 763.40

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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.