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Finding the Fourth Proportional to 815.72, 1,217.58 and 718.52

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Solution

The fourth proportional to 815.72, 1,217.58 and 718.52 is: 1,072.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.72 : 1,217.58 = 718.52 : x
  2. Step 2: Convert to fraction form
    815.72/1,217.58 = 718.52/x
  3. Step 3: Cross multiply
    815.72x = 1,217.58 × 718.52
  4. Step 4: Simplify right side
    815.72x = 874,855.58
  5. Step 5: Solve for x
    x = 874,855.58/815.72
  6. Step 6: Final answer
    x = 1,072.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.