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Finding the Fourth Proportional to 818.42, 1,129.11 and 553.20

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Solution

The fourth proportional to 818.42, 1,129.11 and 553.20 is: 763.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.42 : 1,129.11 = 553.20 : x
  2. Step 2: Convert to fraction form
    818.42/1,129.11 = 553.20/x
  3. Step 3: Cross multiply
    818.42x = 1,129.11 × 553.20
  4. Step 4: Simplify right side
    818.42x = 624,623.65
  5. Step 5: Solve for x
    x = 624,623.65/818.42
  6. Step 6: Final answer
    x = 763.21

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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.