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Finding the Fourth Proportional to 618.06, 921.40 and 587.28

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Solution

The fourth proportional to 618.06, 921.40 and 587.28 is: 875.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.06 : 921.40 = 587.28 : x
  2. Step 2: Convert to fraction form
    618.06/921.40 = 587.28/x
  3. Step 3: Cross multiply
    618.06x = 921.40 × 587.28
  4. Step 4: Simplify right side
    618.06x = 541,119.79
  5. Step 5: Solve for x
    x = 541,119.79/618.06
  6. Step 6: Final answer
    x = 875.51

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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.