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Finding the Fourth Proportional to 907.61, 1,361.70 and 387.41

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Solution

The fourth proportional to 907.61, 1,361.70 and 387.41 is: 581.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.61 : 1,361.70 = 387.41 : x
  2. Step 2: Convert to fraction form
    907.61/1,361.70 = 387.41/x
  3. Step 3: Cross multiply
    907.61x = 1,361.70 × 387.41
  4. Step 4: Simplify right side
    907.61x = 527,529.39
  5. Step 5: Solve for x
    x = 527,529.39/907.61
  6. Step 6: Final answer
    x = 581.23

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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.