Home / 19,815.68-27,369.60-15,678.72

Finding the Fourth Proportional to 19,815.68, 27,369.60 and 15,678.72

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Solution

The fourth proportional to 19,815.68, 27,369.60 and 15,678.72 is: 21,655.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,815.68 : 27,369.60 = 15,678.72 : x
  2. Step 2: Convert to fraction form
    19,815.68/27,369.60 = 15,678.72/x
  3. Step 3: Cross multiply
    19,815.68x = 27,369.60 × 15,678.72
  4. Step 4: Simplify right side
    19,815.68x = 429,120,294.91
  5. Step 5: Solve for x
    x = 429,120,294.91/19,815.68
  6. Step 6: Final answer
    x = 21,655.59

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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.