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Finding the Fourth Proportional to 1,040.44, 1,436.42 and 686.92

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Solution

The fourth proportional to 1,040.44, 1,436.42 and 686.92 is: 948.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.44 : 1,436.42 = 686.92 : x
  2. Step 2: Convert to fraction form
    1,040.44/1,436.42 = 686.92/x
  3. Step 3: Cross multiply
    1,040.44x = 1,436.42 × 686.92
  4. Step 4: Simplify right side
    1,040.44x = 986,705.63
  5. Step 5: Solve for x
    x = 986,705.63/1,040.44
  6. Step 6: Final answer
    x = 948.35

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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.