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Finding the Fourth Proportional to 21,890.58, 32,772.58 and 12,857.34

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Solution

The fourth proportional to 21,890.58, 32,772.58 and 12,857.34 is: 19,248.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,890.58 : 32,772.58 = 12,857.34 : x
  2. Step 2: Convert to fraction form
    21,890.58/32,772.58 = 12,857.34/x
  3. Step 3: Cross multiply
    21,890.58x = 32,772.58 × 12,857.34
  4. Step 4: Simplify right side
    21,890.58x = 421,368,203.74
  5. Step 5: Solve for x
    x = 421,368,203.74/21,890.58
  6. Step 6: Final answer
    x = 19,248.84

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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.