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Finding the Fourth Proportional to 907.58, 1,360.56 and 663.78

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Solution

The fourth proportional to 907.58, 1,360.56 and 663.78 is: 995.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.58 : 1,360.56 = 663.78 : x
  2. Step 2: Convert to fraction form
    907.58/1,360.56 = 663.78/x
  3. Step 3: Cross multiply
    907.58x = 1,360.56 × 663.78
  4. Step 4: Simplify right side
    907.58x = 903,112.52
  5. Step 5: Solve for x
    x = 903,112.52/907.58
  6. Step 6: Final answer
    x = 995.08

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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.