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Finding the Fourth Proportional to 18,657.40, 28,001.40 and 18,511.60

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Solution

The fourth proportional to 18,657.40, 28,001.40 and 18,511.60 is: 27,782.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,657.40 : 28,001.40 = 18,511.60 : x
  2. Step 2: Convert to fraction form
    18,657.40/28,001.40 = 18,511.60/x
  3. Step 3: Cross multiply
    18,657.40x = 28,001.40 × 18,511.60
  4. Step 4: Simplify right side
    18,657.40x = 518,350,716.24
  5. Step 5: Solve for x
    x = 518,350,716.24/18,657.40
  6. Step 6: Final answer
    x = 27,782.58

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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.