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Finding the Fourth Proportional to 815.16, 1,124.64 and 520.05

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Solution

The fourth proportional to 815.16, 1,124.64 and 520.05 is: 717.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.16 : 1,124.64 = 520.05 : x
  2. Step 2: Convert to fraction form
    815.16/1,124.64 = 520.05/x
  3. Step 3: Cross multiply
    815.16x = 1,124.64 × 520.05
  4. Step 4: Simplify right side
    815.16x = 584,869.03
  5. Step 5: Solve for x
    x = 584,869.03/815.16
  6. Step 6: Final answer
    x = 717.49

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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.