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Finding the Fourth Proportional to 907.84, 1,249.56 and 645.40

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Solution

The fourth proportional to 907.84, 1,249.56 and 645.40 is: 888.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.84 : 1,249.56 = 645.40 : x
  2. Step 2: Convert to fraction form
    907.84/1,249.56 = 645.40/x
  3. Step 3: Cross multiply
    907.84x = 1,249.56 × 645.40
  4. Step 4: Simplify right side
    907.84x = 806,466.02
  5. Step 5: Solve for x
    x = 806,466.02/907.84
  6. Step 6: Final answer
    x = 888.33

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1.5x scale

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.