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Finding the Fourth Proportional to 815.01, 1,124.73 and 638.21

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Solution

The fourth proportional to 815.01, 1,124.73 and 638.21 is: 880.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.01 : 1,124.73 = 638.21 : x
  2. Step 2: Convert to fraction form
    815.01/1,124.73 = 638.21/x
  3. Step 3: Cross multiply
    815.01x = 1,124.73 × 638.21
  4. Step 4: Simplify right side
    815.01x = 717,808.31
  5. Step 5: Solve for x
    x = 717,808.31/815.01
  6. Step 6: Final answer
    x = 880.74

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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.