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Finding the Fourth Proportional to 907.21, 1,251.01 and 807.31

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Solution

The fourth proportional to 907.21, 1,251.01 and 807.31 is: 1,113.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.21 : 1,251.01 = 807.31 : x
  2. Step 2: Convert to fraction form
    907.21/1,251.01 = 807.31/x
  3. Step 3: Cross multiply
    907.21x = 1,251.01 × 807.31
  4. Step 4: Simplify right side
    907.21x = 1,009,952.88
  5. Step 5: Solve for x
    x = 1,009,952.88/907.21
  6. Step 6: Final answer
    x = 1,113.25

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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.