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Finding the Fourth Proportional to 907.79, 1,252.94 and 864.72

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Solution

The fourth proportional to 907.79, 1,252.94 and 864.72 is: 1,193.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.79 : 1,252.94 = 864.72 : x
  2. Step 2: Convert to fraction form
    907.79/1,252.94 = 864.72/x
  3. Step 3: Cross multiply
    907.79x = 1,252.94 × 864.72
  4. Step 4: Simplify right side
    907.79x = 1,083,437.95
  5. Step 5: Solve for x
    x = 1,083,437.95/907.79
  6. Step 6: Final answer
    x = 1,193.50

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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.