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Finding the Fourth Proportional to 18,967.90, 28,455.81 and 7,281.04

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Solution

The fourth proportional to 18,967.90, 28,455.81 and 7,281.04 is: 10,923.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,967.90 : 28,455.81 = 7,281.04 : x
  2. Step 2: Convert to fraction form
    18,967.90/28,455.81 = 7,281.04/x
  3. Step 3: Cross multiply
    18,967.90x = 28,455.81 × 7,281.04
  4. Step 4: Simplify right side
    18,967.90x = 207,187,890.84
  5. Step 5: Solve for x
    x = 207,187,890.84/18,967.90
  6. Step 6: Final answer
    x = 10,923.08

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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.