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Finding the Fourth Proportional to 20,535.40, 30,803.10 and 11,787.40

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Solution

The fourth proportional to 20,535.40, 30,803.10 and 11,787.40 is: 17,681.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,535.40 : 30,803.10 = 11,787.40 : x
  2. Step 2: Convert to fraction form
    20,535.40/30,803.10 = 11,787.40/x
  3. Step 3: Cross multiply
    20,535.40x = 30,803.10 × 11,787.40
  4. Step 4: Simplify right side
    20,535.40x = 363,088,460.94
  5. Step 5: Solve for x
    x = 363,088,460.94/20,535.40
  6. Step 6: Final answer
    x = 17,681.10

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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.