Home / 1,039.49-1,434.75-724.80

Finding the Fourth Proportional to 1,039.49, 1,434.75 and 724.80

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Solution

The fourth proportional to 1,039.49, 1,434.75 and 724.80 is: 1,000.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.49 : 1,434.75 = 724.80 : x
  2. Step 2: Convert to fraction form
    1,039.49/1,434.75 = 724.80/x
  3. Step 3: Cross multiply
    1,039.49x = 1,434.75 × 724.80
  4. Step 4: Simplify right side
    1,039.49x = 1,039,906.80
  5. Step 5: Solve for x
    x = 1,039,906.80/1,039.49
  6. Step 6: Final answer
    x = 1,000.40

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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.