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Finding the Fourth Proportional to 628.12, 936.26 and 618.40

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Solution

The fourth proportional to 628.12, 936.26 and 618.40 is: 921.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.12 : 936.26 = 618.40 : x
  2. Step 2: Convert to fraction form
    628.12/936.26 = 618.40/x
  3. Step 3: Cross multiply
    628.12x = 936.26 × 618.40
  4. Step 4: Simplify right side
    628.12x = 578,983.18
  5. Step 5: Solve for x
    x = 578,983.18/628.12
  6. Step 6: Final answer
    x = 921.77

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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.