Home / 20,870.61-28,802.79-11,439.16

Finding the Fourth Proportional to 20,870.61, 28,802.79 and 11,439.16

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Solution

The fourth proportional to 20,870.61, 28,802.79 and 11,439.16 is: 15,786.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.61 : 28,802.79 = 11,439.16 : x
  2. Step 2: Convert to fraction form
    20,870.61/28,802.79 = 11,439.16/x
  3. Step 3: Cross multiply
    20,870.61x = 28,802.79 × 11,439.16
  4. Step 4: Simplify right side
    20,870.61x = 329,479,723.26
  5. Step 5: Solve for x
    x = 329,479,723.26/20,870.61
  6. Step 6: Final answer
    x = 15,786.78

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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.