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Finding the Fourth Proportional to 818.32, 1,129.54 and 653.66

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Solution

The fourth proportional to 818.32, 1,129.54 and 653.66 is: 902.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.32 : 1,129.54 = 653.66 : x
  2. Step 2: Convert to fraction form
    818.32/1,129.54 = 653.66/x
  3. Step 3: Cross multiply
    818.32x = 1,129.54 × 653.66
  4. Step 4: Simplify right side
    818.32x = 738,335.12
  5. Step 5: Solve for x
    x = 738,335.12/818.32
  6. Step 6: Final answer
    x = 902.26

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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.