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Finding the Fourth Proportional to 21,791.68, 32,698.32 and 8,643.76

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Solution

The fourth proportional to 21,791.68, 32,698.32 and 8,643.76 is: 12,969.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,791.68 : 32,698.32 = 8,643.76 : x
  2. Step 2: Convert to fraction form
    21,791.68/32,698.32 = 8,643.76/x
  3. Step 3: Cross multiply
    21,791.68x = 32,698.32 × 8,643.76
  4. Step 4: Simplify right side
    21,791.68x = 282,636,430.48
  5. Step 5: Solve for x
    x = 282,636,430.48/21,791.68
  6. Step 6: Final answer
    x = 12,969.92

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1.5x scale

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.