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Finding the Fourth Proportional to 901.51, 1,348.89 and 642.11

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Solution

The fourth proportional to 901.51, 1,348.89 and 642.11 is: 960.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.51 : 1,348.89 = 642.11 : x
  2. Step 2: Convert to fraction form
    901.51/1,348.89 = 642.11/x
  3. Step 3: Cross multiply
    901.51x = 1,348.89 × 642.11
  4. Step 4: Simplify right side
    901.51x = 866,135.76
  5. Step 5: Solve for x
    x = 866,135.76/901.51
  6. Step 6: Final answer
    x = 960.76

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1.5x scale

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.