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Finding the Fourth Proportional to 21,808.60, 32,712.90 and 18,957.40

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Solution

The fourth proportional to 21,808.60, 32,712.90 and 18,957.40 is: 28,436.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,808.60 : 32,712.90 = 18,957.40 : x
  2. Step 2: Convert to fraction form
    21,808.60/32,712.90 = 18,957.40/x
  3. Step 3: Cross multiply
    21,808.60x = 32,712.90 × 18,957.40
  4. Step 4: Simplify right side
    21,808.60x = 620,151,530.46
  5. Step 5: Solve for x
    x = 620,151,530.46/21,808.60
  6. Step 6: Final answer
    x = 28,436.10

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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.