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Finding the Fourth Proportional to 815.01, 1,123.98 and 690.54

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Solution

The fourth proportional to 815.01, 1,123.98 and 690.54 is: 952.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.01 : 1,123.98 = 690.54 : x
  2. Step 2: Convert to fraction form
    815.01/1,123.98 = 690.54/x
  3. Step 3: Cross multiply
    815.01x = 1,123.98 × 690.54
  4. Step 4: Simplify right side
    815.01x = 776,153.15
  5. Step 5: Solve for x
    x = 776,153.15/815.01
  6. Step 6: Final answer
    x = 952.32

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1.5x scale

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.