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Finding the Fourth Proportional to 815.79, 1,125.80 and 466.48

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Solution

The fourth proportional to 815.79, 1,125.80 and 466.48 is: 643.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.79 : 1,125.80 = 466.48 : x
  2. Step 2: Convert to fraction form
    815.79/1,125.80 = 466.48/x
  3. Step 3: Cross multiply
    815.79x = 1,125.80 × 466.48
  4. Step 4: Simplify right side
    815.79x = 525,163.18
  5. Step 5: Solve for x
    x = 525,163.18/815.79
  6. Step 6: Final answer
    x = 643.75

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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.