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Finding the Fourth Proportional to 1,313.51, 1,812.66 and 724.05

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Solution

The fourth proportional to 1,313.51, 1,812.66 and 724.05 is: 999.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.51 : 1,812.66 = 724.05 : x
  2. Step 2: Convert to fraction form
    1,313.51/1,812.66 = 724.05/x
  3. Step 3: Cross multiply
    1,313.51x = 1,812.66 × 724.05
  4. Step 4: Simplify right side
    1,313.51x = 1,312,456.47
  5. Step 5: Solve for x
    x = 1,312,456.47/1,313.51
  6. Step 6: Final answer
    x = 999.20

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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.