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Finding the Fourth Proportional to 651.23, 975.47 and 621.15

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Solution

The fourth proportional to 651.23, 975.47 and 621.15 is: 930.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.23 : 975.47 = 621.15 : x
  2. Step 2: Convert to fraction form
    651.23/975.47 = 621.15/x
  3. Step 3: Cross multiply
    651.23x = 975.47 × 621.15
  4. Step 4: Simplify right side
    651.23x = 605,910.08
  5. Step 5: Solve for x
    x = 605,910.08/651.23
  6. Step 6: Final answer
    x = 930.42

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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.