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Finding the Fourth Proportional to 10,656.40, 15,989.40 and 5,107.60

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Solution

The fourth proportional to 10,656.40, 15,989.40 and 5,107.60 is: 7,663.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,656.40 : 15,989.40 = 5,107.60 : x
  2. Step 2: Convert to fraction form
    10,656.40/15,989.40 = 5,107.60/x
  3. Step 3: Cross multiply
    10,656.40x = 15,989.40 × 5,107.60
  4. Step 4: Simplify right side
    10,656.40x = 81,667,459.44
  5. Step 5: Solve for x
    x = 81,667,459.44/10,656.40
  6. Step 6: Final answer
    x = 7,663.70

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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.