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Finding the Fourth Proportional to 907.79, 1,361.99 and 387.57

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Solution

The fourth proportional to 907.79, 1,361.99 and 387.57 is: 581.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.79 : 1,361.99 = 387.57 : x
  2. Step 2: Convert to fraction form
    907.79/1,361.99 = 387.57/x
  3. Step 3: Cross multiply
    907.79x = 1,361.99 × 387.57
  4. Step 4: Simplify right side
    907.79x = 527,866.46
  5. Step 5: Solve for x
    x = 527,866.46/907.79
  6. Step 6: Final answer
    x = 581.49

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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.