Home / 12,435.78-18,635.43-7,172.40

Finding the Fourth Proportional to 12,435.78, 18,635.43 and 7,172.40

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Solution

The fourth proportional to 12,435.78, 18,635.43 and 7,172.40 is: 10,748.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,435.78 : 18,635.43 = 7,172.40 : x
  2. Step 2: Convert to fraction form
    12,435.78/18,635.43 = 7,172.40/x
  3. Step 3: Cross multiply
    12,435.78x = 18,635.43 × 7,172.40
  4. Step 4: Simplify right side
    12,435.78x = 133,660,758.13
  5. Step 5: Solve for x
    x = 133,660,758.13/12,435.78
  6. Step 6: Final answer
    x = 10,748.08

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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.