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Finding the Fourth Proportional to 955.78, 1,430.70 and 626.92

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Solution

The fourth proportional to 955.78, 1,430.70 and 626.92 is: 938.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.78 : 1,430.70 = 626.92 : x
  2. Step 2: Convert to fraction form
    955.78/1,430.70 = 626.92/x
  3. Step 3: Cross multiply
    955.78x = 1,430.70 × 626.92
  4. Step 4: Simplify right side
    955.78x = 896,934.44
  5. Step 5: Solve for x
    x = 896,934.44/955.78
  6. Step 6: Final answer
    x = 938.43

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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.