Home / 21,208.17-31,818.62-12,783.81

Finding the Fourth Proportional to 21,208.17, 31,818.62 and 12,783.81

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Solution

The fourth proportional to 21,208.17, 31,818.62 and 12,783.81 is: 19,179.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,208.17 : 31,818.62 = 12,783.81 : x
  2. Step 2: Convert to fraction form
    21,208.17/31,818.62 = 12,783.81/x
  3. Step 3: Cross multiply
    21,208.17x = 31,818.62 × 12,783.81
  4. Step 4: Simplify right side
    21,208.17x = 406,763,128.62
  5. Step 5: Solve for x
    x = 406,763,128.62/21,208.17
  6. Step 6: Final answer
    x = 19,179.55

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1.5x scale

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.