Home / 21,210.48-31,816.82-5,415.66

Finding the Fourth Proportional to 21,210.48, 31,816.82 and 5,415.66

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Solution

The fourth proportional to 21,210.48, 31,816.82 and 5,415.66 is: 8,123.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,210.48 : 31,816.82 = 5,415.66 : x
  2. Step 2: Convert to fraction form
    21,210.48/31,816.82 = 5,415.66/x
  3. Step 3: Cross multiply
    21,210.48x = 31,816.82 × 5,415.66
  4. Step 4: Simplify right side
    21,210.48x = 172,309,079.40
  5. Step 5: Solve for x
    x = 172,309,079.40/21,210.48
  6. Step 6: Final answer
    x = 8,123.77

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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.