Home / 21,271.78-29,358.32-12,778.62

Finding the Fourth Proportional to 21,271.78, 29,358.32 and 12,778.62

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Solution

The fourth proportional to 21,271.78, 29,358.32 and 12,778.62 is: 17,636.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,271.78 : 29,358.32 = 12,778.62 : x
  2. Step 2: Convert to fraction form
    21,271.78/29,358.32 = 12,778.62/x
  3. Step 3: Cross multiply
    21,271.78x = 29,358.32 × 12,778.62
  4. Step 4: Simplify right side
    21,271.78x = 375,158,815.12
  5. Step 5: Solve for x
    x = 375,158,815.12/21,271.78
  6. Step 6: Final answer
    x = 17,636.46

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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.