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Finding the Fourth Proportional to 13,356.40, 18,431.71 and 7,388.01

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Solution

The fourth proportional to 13,356.40, 18,431.71 and 7,388.01 is: 10,195.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,356.40 : 18,431.71 = 7,388.01 : x
  2. Step 2: Convert to fraction form
    13,356.40/18,431.71 = 7,388.01/x
  3. Step 3: Cross multiply
    13,356.40x = 18,431.71 × 7,388.01
  4. Step 4: Simplify right side
    13,356.40x = 136,173,657.80
  5. Step 5: Solve for x
    x = 136,173,657.80/13,356.40
  6. Step 6: Final answer
    x = 10,195.39

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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.