Home / 1,313.16-1,812.18-723.72

Finding the Fourth Proportional to 1,313.16, 1,812.18 and 723.72

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Solution

The fourth proportional to 1,313.16, 1,812.18 and 723.72 is: 998.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.16 : 1,812.18 = 723.72 : x
  2. Step 2: Convert to fraction form
    1,313.16/1,812.18 = 723.72/x
  3. Step 3: Cross multiply
    1,313.16x = 1,812.18 × 723.72
  4. Step 4: Simplify right side
    1,313.16x = 1,311,509.55
  5. Step 5: Solve for x
    x = 1,311,509.55/1,313.16
  6. Step 6: Final answer
    x = 998.74

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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.