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Finding the Fourth Proportional to 21,612.61, 32,418.91 and 6,831.91

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Solution

The fourth proportional to 21,612.61, 32,418.91 and 6,831.91 is: 10,247.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,612.61 : 32,418.91 = 6,831.91 : x
  2. Step 2: Convert to fraction form
    21,612.61/32,418.91 = 6,831.91/x
  3. Step 3: Cross multiply
    21,612.61x = 32,418.91 × 6,831.91
  4. Step 4: Simplify right side
    21,612.61x = 221,483,075.42
  5. Step 5: Solve for x
    x = 221,483,075.42/21,612.61
  6. Step 6: Final answer
    x = 10,247.86

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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.