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Finding the Fourth Proportional to 907.59, 1,251.99 and 686.16

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Solution

The fourth proportional to 907.59, 1,251.99 and 686.16 is: 946.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.59 : 1,251.99 = 686.16 : x
  2. Step 2: Convert to fraction form
    907.59/1,251.99 = 686.16/x
  3. Step 3: Cross multiply
    907.59x = 1,251.99 × 686.16
  4. Step 4: Simplify right side
    907.59x = 859,065.46
  5. Step 5: Solve for x
    x = 859,065.46/907.59
  6. Step 6: Final answer
    x = 946.53

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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.