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Finding the Fourth Proportional to 13,345.36, 18,418 and 7,680.32

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Solution

The fourth proportional to 13,345.36, 18,418 and 7,680.32 is: 10,599.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,345.36 : 18,418 = 7,680.32 : x
  2. Step 2: Convert to fraction form
    13,345.36/18,418 = 7,680.32/x
  3. Step 3: Cross multiply
    13,345.36x = 18,418 × 7,680.32
  4. Step 4: Simplify right side
    13,345.36x = 141,456,133.76
  5. Step 5: Solve for x
    x = 141,456,133.76/13,345.36
  6. Step 6: Final answer
    x = 10,599.65

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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.