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Finding the Fourth Proportional to 818.55, 1,130.15 and 629.16

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Solution

The fourth proportional to 818.55, 1,130.15 and 629.16 is: 868.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.55 : 1,130.15 = 629.16 : x
  2. Step 2: Convert to fraction form
    818.55/1,130.15 = 629.16/x
  3. Step 3: Cross multiply
    818.55x = 1,130.15 × 629.16
  4. Step 4: Simplify right side
    818.55x = 711,045.17
  5. Step 5: Solve for x
    x = 711,045.17/818.55
  6. Step 6: Final answer
    x = 868.66

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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.