Home / 19,218.72-28,828.80-11,870.40

Finding the Fourth Proportional to 19,218.72, 28,828.80 and 11,870.40

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Solution

The fourth proportional to 19,218.72, 28,828.80 and 11,870.40 is: 17,806.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,218.72 : 28,828.80 = 11,870.40 : x
  2. Step 2: Convert to fraction form
    19,218.72/28,828.80 = 11,870.40/x
  3. Step 3: Cross multiply
    19,218.72x = 28,828.80 × 11,870.40
  4. Step 4: Simplify right side
    19,218.72x = 342,209,387.52
  5. Step 5: Solve for x
    x = 342,209,387.52/19,218.72
  6. Step 6: Final answer
    x = 17,806.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.