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Finding the Fourth Proportional to 1,313.72, 1,812.80 and 724.15

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Solution

The fourth proportional to 1,313.72, 1,812.80 and 724.15 is: 999.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.72 : 1,812.80 = 724.15 : x
  2. Step 2: Convert to fraction form
    1,313.72/1,812.80 = 724.15/x
  3. Step 3: Cross multiply
    1,313.72x = 1,812.80 × 724.15
  4. Step 4: Simplify right side
    1,313.72x = 1,312,728.93
  5. Step 5: Solve for x
    x = 1,312,728.93/1,313.72
  6. Step 6: Final answer
    x = 999.24

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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.