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Finding the Fourth Proportional to 21,915.60, 32,844.60 and 19,438.80

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Solution

The fourth proportional to 21,915.60, 32,844.60 and 19,438.80 is: 29,132.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,915.60 : 32,844.60 = 19,438.80 : x
  2. Step 2: Convert to fraction form
    21,915.60/32,844.60 = 19,438.80/x
  3. Step 3: Cross multiply
    21,915.60x = 32,844.60 × 19,438.80
  4. Step 4: Simplify right side
    21,915.60x = 638,459,610.48
  5. Step 5: Solve for x
    x = 638,459,610.48/21,915.60
  6. Step 6: Final answer
    x = 29,132.65

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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.