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Finding the Fourth Proportional to 623.18, 935.40 and 391.52

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Solution

The fourth proportional to 623.18, 935.40 and 391.52 is: 587.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.18 : 935.40 = 391.52 : x
  2. Step 2: Convert to fraction form
    623.18/935.40 = 391.52/x
  3. Step 3: Cross multiply
    623.18x = 935.40 × 391.52
  4. Step 4: Simplify right side
    623.18x = 366,227.81
  5. Step 5: Solve for x
    x = 366,227.81/623.18
  6. Step 6: Final answer
    x = 587.68

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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.