Home / 15,920.64-21,978.24-10,911.36

Finding the Fourth Proportional to 15,920.64, 21,978.24 and 10,911.36

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Solution

The fourth proportional to 15,920.64, 21,978.24 and 10,911.36 is: 15,062.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,920.64 : 21,978.24 = 10,911.36 : x
  2. Step 2: Convert to fraction form
    15,920.64/21,978.24 = 10,911.36/x
  3. Step 3: Cross multiply
    15,920.64x = 21,978.24 × 10,911.36
  4. Step 4: Simplify right side
    15,920.64x = 239,812,488.81
  5. Step 5: Solve for x
    x = 239,812,488.81/15,920.64
  6. Step 6: Final answer
    x = 15,062.99

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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.