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Finding the Fourth Proportional to 838.56, 1,155.60 and 558.48

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Solution

The fourth proportional to 838.56, 1,155.60 and 558.48 is: 769.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.56 : 1,155.60 = 558.48 : x
  2. Step 2: Convert to fraction form
    838.56/1,155.60 = 558.48/x
  3. Step 3: Cross multiply
    838.56x = 1,155.60 × 558.48
  4. Step 4: Simplify right side
    838.56x = 645,379.49
  5. Step 5: Solve for x
    x = 645,379.49/838.56
  6. Step 6: Final answer
    x = 769.63

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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.