Home / 11,145.10-15,380.28-6,429.40

Finding the Fourth Proportional to 11,145.10, 15,380.28 and 6,429.40

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Solution

The fourth proportional to 11,145.10, 15,380.28 and 6,429.40 is: 8,872.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,145.10 : 15,380.28 = 6,429.40 : x
  2. Step 2: Convert to fraction form
    11,145.10/15,380.28 = 6,429.40/x
  3. Step 3: Cross multiply
    11,145.10x = 15,380.28 × 6,429.40
  4. Step 4: Simplify right side
    11,145.10x = 98,885,972.23
  5. Step 5: Solve for x
    x = 98,885,972.23/11,145.10
  6. Step 6: Final answer
    x = 8,872.60

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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.