Home / 20,870.65-28,801.33-11,439.19

Finding the Fourth Proportional to 20,870.65, 28,801.33 and 11,439.19

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Solution

The fourth proportional to 20,870.65, 28,801.33 and 11,439.19 is: 15,785.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.65 : 28,801.33 = 11,439.19 : x
  2. Step 2: Convert to fraction form
    20,870.65/28,801.33 = 11,439.19/x
  3. Step 3: Cross multiply
    20,870.65x = 28,801.33 × 11,439.19
  4. Step 4: Simplify right side
    20,870.65x = 329,463,886.12
  5. Step 5: Solve for x
    x = 329,463,886.12/20,870.65
  6. Step 6: Final answer
    x = 15,785.99

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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.