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Finding the Fourth Proportional to 21,630, 32,457.96 and 9,318

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Solution

The fourth proportional to 21,630, 32,457.96 and 9,318 is: 13,982.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,630 : 32,457.96 = 9,318 : x
  2. Step 2: Convert to fraction form
    21,630/32,457.96 = 9,318/x
  3. Step 3: Cross multiply
    21,630x = 32,457.96 × 9,318
  4. Step 4: Simplify right side
    21,630x = 302,443,271.28
  5. Step 5: Solve for x
    x = 302,443,271.28/21,630
  6. Step 6: Final answer
    x = 13,982.58

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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.