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Finding the Fourth Proportional to 20,187.40, 28,285.40 and 20,187.40

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Solution

The fourth proportional to 20,187.40, 28,285.40 and 20,187.40 is: 28,285.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,187.40 : 28,285.40 = 20,187.40 : x
  2. Step 2: Convert to fraction form
    20,187.40/28,285.40 = 20,187.40/x
  3. Step 3: Cross multiply
    20,187.40x = 28,285.40 × 20,187.40
  4. Step 4: Simplify right side
    20,187.40x = 571,008,683.96
  5. Step 5: Solve for x
    x = 571,008,683.96/20,187.40
  6. Step 6: Final answer
    x = 28,285.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.