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Finding the Fourth Proportional to 907.71, 1,360.80 and 421.11

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Solution

The fourth proportional to 907.71, 1,360.80 and 421.11 is: 631.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.71 : 1,360.80 = 421.11 : x
  2. Step 2: Convert to fraction form
    907.71/1,360.80 = 421.11/x
  3. Step 3: Cross multiply
    907.71x = 1,360.80 × 421.11
  4. Step 4: Simplify right side
    907.71x = 573,046.49
  5. Step 5: Solve for x
    x = 573,046.49/907.71
  6. Step 6: Final answer
    x = 631.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.