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Finding the Fourth Proportional to 939.64, 1,411.62 and 722.56

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Solution

The fourth proportional to 939.64, 1,411.62 and 722.56 is: 1,085.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.64 : 1,411.62 = 722.56 : x
  2. Step 2: Convert to fraction form
    939.64/1,411.62 = 722.56/x
  3. Step 3: Cross multiply
    939.64x = 1,411.62 × 722.56
  4. Step 4: Simplify right side
    939.64x = 1,019,980.15
  5. Step 5: Solve for x
    x = 1,019,980.15/939.64
  6. Step 6: Final answer
    x = 1,085.50

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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.