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Finding the Fourth Proportional to 28,400.80, 42,644.40 and 21,834.40

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Solution

The fourth proportional to 28,400.80, 42,644.40 and 21,834.40 is: 32,784.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,400.80 : 42,644.40 = 21,834.40 : x
  2. Step 2: Convert to fraction form
    28,400.80/42,644.40 = 21,834.40/x
  3. Step 3: Cross multiply
    28,400.80x = 42,644.40 × 21,834.40
  4. Step 4: Simplify right side
    28,400.80x = 931,114,887.36
  5. Step 5: Solve for x
    x = 931,114,887.36/28,400.80
  6. Step 6: Final answer
    x = 32,784.81

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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.