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Finding the Fourth Proportional to 815.23, 1,223.13 and 425.35

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Solution

The fourth proportional to 815.23, 1,223.13 and 425.35 is: 638.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.23 : 1,223.13 = 425.35 : x
  2. Step 2: Convert to fraction form
    815.23/1,223.13 = 425.35/x
  3. Step 3: Cross multiply
    815.23x = 1,223.13 × 425.35
  4. Step 4: Simplify right side
    815.23x = 520,258.35
  5. Step 5: Solve for x
    x = 520,258.35/815.23
  6. Step 6: Final answer
    x = 638.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.