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Finding the Fourth Proportional to 815.60, 1,125.08 and 505.04

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Solution

The fourth proportional to 815.60, 1,125.08 and 505.04 is: 696.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.60 : 1,125.08 = 505.04 : x
  2. Step 2: Convert to fraction form
    815.60/1,125.08 = 505.04/x
  3. Step 3: Cross multiply
    815.60x = 1,125.08 × 505.04
  4. Step 4: Simplify right side
    815.60x = 568,210.40
  5. Step 5: Solve for x
    x = 568,210.40/815.60
  6. Step 6: Final answer
    x = 696.68

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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.