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Finding the Fourth Proportional to 907.56, 1,361.39 and 387.63

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Solution

The fourth proportional to 907.56, 1,361.39 and 387.63 is: 581.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.56 : 1,361.39 = 387.63 : x
  2. Step 2: Convert to fraction form
    907.56/1,361.39 = 387.63/x
  3. Step 3: Cross multiply
    907.56x = 1,361.39 × 387.63
  4. Step 4: Simplify right side
    907.56x = 527,713.67
  5. Step 5: Solve for x
    x = 527,713.67/907.56
  6. Step 6: Final answer
    x = 581.46

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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.