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Finding the Fourth Proportional to 15,218.12, 21,000.12 and 8,503.50

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Solution

The fourth proportional to 15,218.12, 21,000.12 and 8,503.50 is: 11,734.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,218.12 : 21,000.12 = 8,503.50 : x
  2. Step 2: Convert to fraction form
    15,218.12/21,000.12 = 8,503.50/x
  3. Step 3: Cross multiply
    15,218.12x = 21,000.12 × 8,503.50
  4. Step 4: Simplify right side
    15,218.12x = 178,574,520.42
  5. Step 5: Solve for x
    x = 178,574,520.42/15,218.12
  6. Step 6: Final answer
    x = 11,734.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.