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Finding the Fourth Proportional to 840.44, 1,254.99 and 686.67

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Solution

The fourth proportional to 840.44, 1,254.99 and 686.67 is: 1,025.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.44 : 1,254.99 = 686.67 : x
  2. Step 2: Convert to fraction form
    840.44/1,254.99 = 686.67/x
  3. Step 3: Cross multiply
    840.44x = 1,254.99 × 686.67
  4. Step 4: Simplify right side
    840.44x = 861,757.99
  5. Step 5: Solve for x
    x = 861,757.99/840.44
  6. Step 6: Final answer
    x = 1,025.36

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.