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Finding the Fourth Proportional to 907.75, 1,361.80 and 387.75

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Solution

The fourth proportional to 907.75, 1,361.80 and 387.75 is: 581.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.75 : 1,361.80 = 387.75 : x
  2. Step 2: Convert to fraction form
    907.75/1,361.80 = 387.75/x
  3. Step 3: Cross multiply
    907.75x = 1,361.80 × 387.75
  4. Step 4: Simplify right side
    907.75x = 528,037.95
  5. Step 5: Solve for x
    x = 528,037.95/907.75
  6. Step 6: Final answer
    x = 581.70

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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.