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Finding the Fourth Proportional to 901.54, 1,242.29 and 691.70

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Solution

The fourth proportional to 901.54, 1,242.29 and 691.70 is: 953.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.54 : 1,242.29 = 691.70 : x
  2. Step 2: Convert to fraction form
    901.54/1,242.29 = 691.70/x
  3. Step 3: Cross multiply
    901.54x = 1,242.29 × 691.70
  4. Step 4: Simplify right side
    901.54x = 859,291.99
  5. Step 5: Solve for x
    x = 859,291.99/901.54
  6. Step 6: Final answer
    x = 953.14

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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.