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Finding the Fourth Proportional to 21,390.74, 32,068.77 and 8,920.11

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Solution

The fourth proportional to 21,390.74, 32,068.77 and 8,920.11 is: 13,372.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.74 : 32,068.77 = 8,920.11 : x
  2. Step 2: Convert to fraction form
    21,390.74/32,068.77 = 8,920.11/x
  3. Step 3: Cross multiply
    21,390.74x = 32,068.77 × 8,920.11
  4. Step 4: Simplify right side
    21,390.74x = 286,056,955.96
  5. Step 5: Solve for x
    x = 286,056,955.96/21,390.74
  6. Step 6: Final answer
    x = 13,372.94

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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.