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Finding the Fourth Proportional to 907.20, 1,251.60 and 670.56

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Solution

The fourth proportional to 907.20, 1,251.60 and 670.56 is: 925.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.20 : 1,251.60 = 670.56 : x
  2. Step 2: Convert to fraction form
    907.20/1,251.60 = 670.56/x
  3. Step 3: Cross multiply
    907.20x = 1,251.60 × 670.56
  4. Step 4: Simplify right side
    907.20x = 839,272.90
  5. Step 5: Solve for x
    x = 839,272.90/907.20
  6. Step 6: Final answer
    x = 925.12

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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.