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Finding the Fourth Proportional to 1,313.04, 1,812.76 and 815.95

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Solution

The fourth proportional to 1,313.04, 1,812.76 and 815.95 is: 1,126.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.04 : 1,812.76 = 815.95 : x
  2. Step 2: Convert to fraction form
    1,313.04/1,812.76 = 815.95/x
  3. Step 3: Cross multiply
    1,313.04x = 1,812.76 × 815.95
  4. Step 4: Simplify right side
    1,313.04x = 1,479,121.52
  5. Step 5: Solve for x
    x = 1,479,121.52/1,313.04
  6. Step 6: Final answer
    x = 1,126.49

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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.