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Finding the Fourth Proportional to 907.80, 1,360.49 and 387.51

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Solution

The fourth proportional to 907.80, 1,360.49 and 387.51 is: 580.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.80 : 1,360.49 = 387.51 : x
  2. Step 2: Convert to fraction form
    907.80/1,360.49 = 387.51/x
  3. Step 3: Cross multiply
    907.80x = 1,360.49 × 387.51
  4. Step 4: Simplify right side
    907.80x = 527,201.54
  5. Step 5: Solve for x
    x = 527,201.54/907.80
  6. Step 6: Final answer
    x = 580.75

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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.