Home / 21,285.81-31,895.89-13,478.22

Finding the Fourth Proportional to 21,285.81, 31,895.89 and 13,478.22

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Solution

The fourth proportional to 21,285.81, 31,895.89 and 13,478.22 is: 20,196.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,285.81 : 31,895.89 = 13,478.22 : x
  2. Step 2: Convert to fraction form
    21,285.81/31,895.89 = 13,478.22/x
  3. Step 3: Cross multiply
    21,285.81x = 31,895.89 × 13,478.22
  4. Step 4: Simplify right side
    21,285.81x = 429,899,822.52
  5. Step 5: Solve for x
    x = 429,899,822.52/21,285.81
  6. Step 6: Final answer
    x = 20,196.55

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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.