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Finding the Fourth Proportional to 8,390.31, 11,579.54 and 5,247.51

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Solution

The fourth proportional to 8,390.31, 11,579.54 and 5,247.51 is: 7,242.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,390.31 : 11,579.54 = 5,247.51 : x
  2. Step 2: Convert to fraction form
    8,390.31/11,579.54 = 5,247.51/x
  3. Step 3: Cross multiply
    8,390.31x = 11,579.54 × 5,247.51
  4. Step 4: Simplify right side
    8,390.31x = 60,763,725.71
  5. Step 5: Solve for x
    x = 60,763,725.71/8,390.31
  6. Step 6: Final answer
    x = 7,242.13

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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.