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Finding the Fourth Proportional to 840.23, 1,254.68 and 686.45

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Solution

The fourth proportional to 840.23, 1,254.68 and 686.45 is: 1,025.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.23 : 1,254.68 = 686.45 : x
  2. Step 2: Convert to fraction form
    840.23/1,254.68 = 686.45/x
  3. Step 3: Cross multiply
    840.23x = 1,254.68 × 686.45
  4. Step 4: Simplify right side
    840.23x = 861,275.09
  5. Step 5: Solve for x
    x = 861,275.09/840.23
  6. Step 6: Final answer
    x = 1,025.05

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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.