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Finding the Fourth Proportional to 18,909.90, 28,364.85 and 12,300.30

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Solution

The fourth proportional to 18,909.90, 28,364.85 and 12,300.30 is: 18,450.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.90 : 28,364.85 = 12,300.30 : x
  2. Step 2: Convert to fraction form
    18,909.90/28,364.85 = 12,300.30/x
  3. Step 3: Cross multiply
    18,909.90x = 28,364.85 × 12,300.30
  4. Step 4: Simplify right side
    18,909.90x = 348,896,164.46
  5. Step 5: Solve for x
    x = 348,896,164.46/18,909.90
  6. Step 6: Final answer
    x = 18,450.45

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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.