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Finding the Fourth Proportional to 722.16, 1,077.90 and 636.72

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Solution

The fourth proportional to 722.16, 1,077.90 and 636.72 is: 950.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.16 : 1,077.90 = 636.72 : x
  2. Step 2: Convert to fraction form
    722.16/1,077.90 = 636.72/x
  3. Step 3: Cross multiply
    722.16x = 1,077.90 × 636.72
  4. Step 4: Simplify right side
    722.16x = 686,320.49
  5. Step 5: Solve for x
    x = 686,320.49/722.16
  6. Step 6: Final answer
    x = 950.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.