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Finding the Fourth Proportional to 838.14, 1,155.36 and 690.54

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Solution

The fourth proportional to 838.14, 1,155.36 and 690.54 is: 951.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.14 : 1,155.36 = 690.54 : x
  2. Step 2: Convert to fraction form
    838.14/1,155.36 = 690.54/x
  3. Step 3: Cross multiply
    838.14x = 1,155.36 × 690.54
  4. Step 4: Simplify right side
    838.14x = 797,822.29
  5. Step 5: Solve for x
    x = 797,822.29/838.14
  6. Step 6: Final answer
    x = 951.90

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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.