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Finding the Fourth Proportional to 18,907.61, 28,378.92 and 9,554.21

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Solution

The fourth proportional to 18,907.61, 28,378.92 and 9,554.21 is: 14,340.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,907.61 : 28,378.92 = 9,554.21 : x
  2. Step 2: Convert to fraction form
    18,907.61/28,378.92 = 9,554.21/x
  3. Step 3: Cross multiply
    18,907.61x = 28,378.92 × 9,554.21
  4. Step 4: Simplify right side
    18,907.61x = 271,138,019.36
  5. Step 5: Solve for x
    x = 271,138,019.36/18,907.61
  6. Step 6: Final answer
    x = 14,340.16

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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.