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Finding the Fourth Proportional to 815.83, 1,125.50 and 520.58

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Solution

The fourth proportional to 815.83, 1,125.50 and 520.58 is: 718.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.83 : 1,125.50 = 520.58 : x
  2. Step 2: Convert to fraction form
    815.83/1,125.50 = 520.58/x
  3. Step 3: Cross multiply
    815.83x = 1,125.50 × 520.58
  4. Step 4: Simplify right side
    815.83x = 585,913.00
  5. Step 5: Solve for x
    x = 585,913.00/815.83
  6. Step 6: Final answer
    x = 718.18

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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.