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Finding the Fourth Proportional to 21,535.80, 32,230.80 and 18,911.40

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Solution

The fourth proportional to 21,535.80, 32,230.80 and 18,911.40 is: 28,303.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,535.80 : 32,230.80 = 18,911.40 : x
  2. Step 2: Convert to fraction form
    21,535.80/32,230.80 = 18,911.40/x
  3. Step 3: Cross multiply
    21,535.80x = 32,230.80 × 18,911.40
  4. Step 4: Simplify right side
    21,535.80x = 609,529,551.12
  5. Step 5: Solve for x
    x = 609,529,551.12/21,535.80
  6. Step 6: Final answer
    x = 28,303.08

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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.