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Finding the Fourth Proportional to 20,543.80, 28,405.74 and 17,919.40

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Solution

The fourth proportional to 20,543.80, 28,405.74 and 17,919.40 is: 24,777.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,543.80 : 28,405.74 = 17,919.40 : x
  2. Step 2: Convert to fraction form
    20,543.80/28,405.74 = 17,919.40/x
  3. Step 3: Cross multiply
    20,543.80x = 28,405.74 × 17,919.40
  4. Step 4: Simplify right side
    20,543.80x = 509,013,817.36
  5. Step 5: Solve for x
    x = 509,013,817.36/20,543.80
  6. Step 6: Final answer
    x = 24,777.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.