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Finding the Fourth Proportional to 1,313.69, 1,812.85 and 724.21

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Solution

The fourth proportional to 1,313.69, 1,812.85 and 724.21 is: 999.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.69 : 1,812.85 = 724.21 : x
  2. Step 2: Convert to fraction form
    1,313.69/1,812.85 = 724.21/x
  3. Step 3: Cross multiply
    1,313.69x = 1,812.85 × 724.21
  4. Step 4: Simplify right side
    1,313.69x = 1,312,877.76
  5. Step 5: Solve for x
    x = 1,312,877.76/1,313.69
  6. Step 6: Final answer
    x = 999.39

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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.