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Finding the Fourth Proportional to 943.90, 1,417.20 and 738.70

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Solution

The fourth proportional to 943.90, 1,417.20 and 738.70 is: 1,109.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.90 : 1,417.20 = 738.70 : x
  2. Step 2: Convert to fraction form
    943.90/1,417.20 = 738.70/x
  3. Step 3: Cross multiply
    943.90x = 1,417.20 × 738.70
  4. Step 4: Simplify right side
    943.90x = 1,046,885.64
  5. Step 5: Solve for x
    x = 1,046,885.64/943.90
  6. Step 6: Final answer
    x = 1,109.11

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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.