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Finding the Fourth Proportional to 907.68, 1,252.80 and 553.68

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Solution

The fourth proportional to 907.68, 1,252.80 and 553.68 is: 764.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.68 : 1,252.80 = 553.68 : x
  2. Step 2: Convert to fraction form
    907.68/1,252.80 = 553.68/x
  3. Step 3: Cross multiply
    907.68x = 1,252.80 × 553.68
  4. Step 4: Simplify right side
    907.68x = 693,650.30
  5. Step 5: Solve for x
    x = 693,650.30/907.68
  6. Step 6: Final answer
    x = 764.20

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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.