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Finding the Fourth Proportional to 838.16, 1,157.15 and 558.78

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Solution

The fourth proportional to 838.16, 1,157.15 and 558.78 is: 771.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.16 : 1,157.15 = 558.78 : x
  2. Step 2: Convert to fraction form
    838.16/1,157.15 = 558.78/x
  3. Step 3: Cross multiply
    838.16x = 1,157.15 × 558.78
  4. Step 4: Simplify right side
    838.16x = 646,589.48
  5. Step 5: Solve for x
    x = 646,589.48/838.16
  6. Step 6: Final answer
    x = 771.44

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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.