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Finding the Fourth Proportional to 1,283.69, 1,771.45 and 724.15

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Solution

The fourth proportional to 1,283.69, 1,771.45 and 724.15 is: 999.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.69 : 1,771.45 = 724.15 : x
  2. Step 2: Convert to fraction form
    1,283.69/1,771.45 = 724.15/x
  3. Step 3: Cross multiply
    1,283.69x = 1,771.45 × 724.15
  4. Step 4: Simplify right side
    1,283.69x = 1,282,789.28
  5. Step 5: Solve for x
    x = 1,282,789.28/1,283.69
  6. Step 6: Final answer
    x = 999.30

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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.