Home / 15,784.18-21,781.32-9,815.68

Finding the Fourth Proportional to 15,784.18, 21,781.32 and 9,815.68

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Solution

The fourth proportional to 15,784.18, 21,781.32 and 9,815.68 is: 13,545.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,784.18 : 21,781.32 = 9,815.68 : x
  2. Step 2: Convert to fraction form
    15,784.18/21,781.32 = 9,815.68/x
  3. Step 3: Cross multiply
    15,784.18x = 21,781.32 × 9,815.68
  4. Step 4: Simplify right side
    15,784.18x = 213,798,467.10
  5. Step 5: Solve for x
    x = 213,798,467.10/15,784.18
  6. Step 6: Final answer
    x = 13,545.11

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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.