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Finding the Fourth Proportional to 907.90, 1,253 and 553.93

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Solution

The fourth proportional to 907.90, 1,253 and 553.93 is: 764.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.90 : 1,253 = 553.93 : x
  2. Step 2: Convert to fraction form
    907.90/1,253 = 553.93/x
  3. Step 3: Cross multiply
    907.90x = 1,253 × 553.93
  4. Step 4: Simplify right side
    907.90x = 694,074.29
  5. Step 5: Solve for x
    x = 694,074.29/907.90
  6. Step 6: Final answer
    x = 764.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.