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Finding the Fourth Proportional to 9,419.78, 12,999.51 and 5,228.30

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Solution

The fourth proportional to 9,419.78, 12,999.51 and 5,228.30 is: 7,215.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,419.78 : 12,999.51 = 5,228.30 : x
  2. Step 2: Convert to fraction form
    9,419.78/12,999.51 = 5,228.30/x
  3. Step 3: Cross multiply
    9,419.78x = 12,999.51 × 5,228.30
  4. Step 4: Simplify right side
    9,419.78x = 67,965,338.13
  5. Step 5: Solve for x
    x = 67,965,338.13/9,419.78
  6. Step 6: Final answer
    x = 7,215.17

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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.