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Finding the Fourth Proportional to 21,911.40, 32,915.70 and 21,328.20

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Solution

The fourth proportional to 21,911.40, 32,915.70 and 21,328.20 is: 32,039.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,911.40 : 32,915.70 = 21,328.20 : x
  2. Step 2: Convert to fraction form
    21,911.40/32,915.70 = 21,328.20/x
  3. Step 3: Cross multiply
    21,911.40x = 32,915.70 × 21,328.20
  4. Step 4: Simplify right side
    21,911.40x = 702,032,632.74
  5. Step 5: Solve for x
    x = 702,032,632.74/21,911.40
  6. Step 6: Final answer
    x = 32,039.61

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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.