Home / 10,929.12-15,055.84-8,690.28

Finding the Fourth Proportional to 10,929.12, 15,055.84 and 8,690.28

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Solution

The fourth proportional to 10,929.12, 15,055.84 and 8,690.28 is: 11,971.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,929.12 : 15,055.84 = 8,690.28 : x
  2. Step 2: Convert to fraction form
    10,929.12/15,055.84 = 8,690.28/x
  3. Step 3: Cross multiply
    10,929.12x = 15,055.84 × 8,690.28
  4. Step 4: Simplify right side
    10,929.12x = 130,839,465.24
  5. Step 5: Solve for x
    x = 130,839,465.24/10,929.12
  6. Step 6: Final answer
    x = 11,971.64

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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.