Home / 20,390.61-28,148.93-13,673.78

Finding the Fourth Proportional to 20,390.61, 28,148.93 and 13,673.78

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Solution

The fourth proportional to 20,390.61, 28,148.93 and 13,673.78 is: 18,876.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.61 : 28,148.93 = 13,673.78 : x
  2. Step 2: Convert to fraction form
    20,390.61/28,148.93 = 13,673.78/x
  3. Step 3: Cross multiply
    20,390.61x = 28,148.93 × 13,673.78
  4. Step 4: Simplify right side
    20,390.61x = 384,902,329.34
  5. Step 5: Solve for x
    x = 384,902,329.34/20,390.61
  6. Step 6: Final answer
    x = 18,876.45

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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.