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Finding the Fourth Proportional to 21,879.61, 32,812.53 and 7,085.11

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Solution

The fourth proportional to 21,879.61, 32,812.53 and 7,085.11 is: 10,625.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.61 : 32,812.53 = 7,085.11 : x
  2. Step 2: Convert to fraction form
    21,879.61/32,812.53 = 7,085.11/x
  3. Step 3: Cross multiply
    21,879.61x = 32,812.53 × 7,085.11
  4. Step 4: Simplify right side
    21,879.61x = 232,480,384.43
  5. Step 5: Solve for x
    x = 232,480,384.43/21,879.61
  6. Step 6: Final answer
    x = 10,625.44

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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.