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Finding the Fourth Proportional to 907.65, 1,252.94 and 686.66

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Solution

The fourth proportional to 907.65, 1,252.94 and 686.66 is: 947.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.65 : 1,252.94 = 686.66 : x
  2. Step 2: Convert to fraction form
    907.65/1,252.94 = 686.66/x
  3. Step 3: Cross multiply
    907.65x = 1,252.94 × 686.66
  4. Step 4: Simplify right side
    907.65x = 860,334.08
  5. Step 5: Solve for x
    x = 860,334.08/907.65
  6. Step 6: Final answer
    x = 947.87

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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.