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Finding the Fourth Proportional to 763.70, 1,053.90 and 414.38

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Solution

The fourth proportional to 763.70, 1,053.90 and 414.38 is: 571.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.70 : 1,053.90 = 414.38 : x
  2. Step 2: Convert to fraction form
    763.70/1,053.90 = 414.38/x
  3. Step 3: Cross multiply
    763.70x = 1,053.90 × 414.38
  4. Step 4: Simplify right side
    763.70x = 436,717.72
  5. Step 5: Solve for x
    x = 436,717.72/763.70
  6. Step 6: Final answer
    x = 571.85

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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.