Home / 10,868.34-15,000.64-6,620.78

Finding the Fourth Proportional to 10,868.34, 15,000.64 and 6,620.78

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Solution

The fourth proportional to 10,868.34, 15,000.64 and 6,620.78 is: 9,138.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,868.34 : 15,000.64 = 6,620.78 : x
  2. Step 2: Convert to fraction form
    10,868.34/15,000.64 = 6,620.78/x
  3. Step 3: Cross multiply
    10,868.34x = 15,000.64 × 6,620.78
  4. Step 4: Simplify right side
    10,868.34x = 99,315,937.30
  5. Step 5: Solve for x
    x = 99,315,937.30/10,868.34
  6. Step 6: Final answer
    x = 9,138.10

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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.