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Finding the Fourth Proportional to 975.91, 1,462.98 and 427.79

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Solution

The fourth proportional to 975.91, 1,462.98 and 427.79 is: 641.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.91 : 1,462.98 = 427.79 : x
  2. Step 2: Convert to fraction form
    975.91/1,462.98 = 427.79/x
  3. Step 3: Cross multiply
    975.91x = 1,462.98 × 427.79
  4. Step 4: Simplify right side
    975.91x = 625,848.21
  5. Step 5: Solve for x
    x = 625,848.21/975.91
  6. Step 6: Final answer
    x = 641.30

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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.