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Finding the Fourth Proportional to 1,315.11, 1,814.84 and 717.60

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Solution

The fourth proportional to 1,315.11, 1,814.84 and 717.60 is: 990.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.11 : 1,814.84 = 717.60 : x
  2. Step 2: Convert to fraction form
    1,315.11/1,814.84 = 717.60/x
  3. Step 3: Cross multiply
    1,315.11x = 1,814.84 × 717.60
  4. Step 4: Simplify right side
    1,315.11x = 1,302,316.52
  5. Step 5: Solve for x
    x = 1,302,316.52/1,315.11
  6. Step 6: Final answer
    x = 990.28

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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.