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Finding the Fourth Proportional to 1,315.48, 1,815.34 and 717.95

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Solution

The fourth proportional to 1,315.48, 1,815.34 and 717.95 is: 990.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.48 : 1,815.34 = 717.95 : x
  2. Step 2: Convert to fraction form
    1,315.48/1,815.34 = 717.95/x
  3. Step 3: Cross multiply
    1,315.48x = 1,815.34 × 717.95
  4. Step 4: Simplify right side
    1,315.48x = 1,303,310.69
  5. Step 5: Solve for x
    x = 1,303,310.69/1,315.48
  6. Step 6: Final answer
    x = 990.75

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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.