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Finding the Fourth Proportional to 18,705.40, 28,058.10 and 16,858.60

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Solution

The fourth proportional to 18,705.40, 28,058.10 and 16,858.60 is: 25,287.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,705.40 : 28,058.10 = 16,858.60 : x
  2. Step 2: Convert to fraction form
    18,705.40/28,058.10 = 16,858.60/x
  3. Step 3: Cross multiply
    18,705.40x = 28,058.10 × 16,858.60
  4. Step 4: Simplify right side
    18,705.40x = 473,020,284.66
  5. Step 5: Solve for x
    x = 473,020,284.66/18,705.40
  6. Step 6: Final answer
    x = 25,287.90

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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.