Home / 1,426.19-2,139.32-489.35

Finding the Fourth Proportional to 1,426.19, 2,139.32 and 489.35

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Solution

The fourth proportional to 1,426.19, 2,139.32 and 489.35 is: 734.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.19 : 2,139.32 = 489.35 : x
  2. Step 2: Convert to fraction form
    1,426.19/2,139.32 = 489.35/x
  3. Step 3: Cross multiply
    1,426.19x = 2,139.32 × 489.35
  4. Step 4: Simplify right side
    1,426.19x = 1,046,881.82
  5. Step 5: Solve for x
    x = 1,046,881.82/1,426.19
  6. Step 6: Final answer
    x = 734.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.