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Finding the Fourth Proportional to 18,705.60, 28,058.40 and 9,938.16

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Solution

The fourth proportional to 18,705.60, 28,058.40 and 9,938.16 is: 14,907.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,705.60 : 28,058.40 = 9,938.16 : x
  2. Step 2: Convert to fraction form
    18,705.60/28,058.40 = 9,938.16/x
  3. Step 3: Cross multiply
    18,705.60x = 28,058.40 × 9,938.16
  4. Step 4: Simplify right side
    18,705.60x = 278,848,868.54
  5. Step 5: Solve for x
    x = 278,848,868.54/18,705.60
  6. Step 6: Final answer
    x = 14,907.24

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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.