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Finding the Fourth Proportional to 1,315.96, 1,816.06 and 718.49

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Solution

The fourth proportional to 1,315.96, 1,816.06 and 718.49 is: 991.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.96 : 1,816.06 = 718.49 : x
  2. Step 2: Convert to fraction form
    1,315.96/1,816.06 = 718.49/x
  3. Step 3: Cross multiply
    1,315.96x = 1,816.06 × 718.49
  4. Step 4: Simplify right side
    1,315.96x = 1,304,808.28
  5. Step 5: Solve for x
    x = 1,304,808.28/1,315.96
  6. Step 6: Final answer
    x = 991.53

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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.