Home / 10,420.78-14,380.68-5,705.36

Finding the Fourth Proportional to 10,420.78, 14,380.68 and 5,705.36

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Solution

The fourth proportional to 10,420.78, 14,380.68 and 5,705.36 is: 7,873.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,420.78 : 14,380.68 = 5,705.36 : x
  2. Step 2: Convert to fraction form
    10,420.78/14,380.68 = 5,705.36/x
  3. Step 3: Cross multiply
    10,420.78x = 14,380.68 × 5,705.36
  4. Step 4: Simplify right side
    10,420.78x = 82,046,956.44
  5. Step 5: Solve for x
    x = 82,046,956.44/10,420.78
  6. Step 6: Final answer
    x = 7,873.40

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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.