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Finding the Fourth Proportional to 421, 631.50 and 117

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Solution

The fourth proportional to 421, 631.50 and 117 is: 175.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    421 : 631.50 = 117 : x
  2. Step 2: Convert to fraction form
    421/631.50 = 117/x
  3. Step 3: Cross multiply
    421x = 631.50 × 117
  4. Step 4: Simplify right side
    421x = 73,885.50
  5. Step 5: Solve for x
    x = 73,885.50/421
  6. Step 6: Final answer
    x = 175.50

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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.