Home / 21,218.81-31,784.47-12,427.07

Finding the Fourth Proportional to 21,218.81, 31,784.47 and 12,427.07

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Solution

The fourth proportional to 21,218.81, 31,784.47 and 12,427.07 is: 18,614.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,218.81 : 31,784.47 = 12,427.07 : x
  2. Step 2: Convert to fraction form
    21,218.81/31,784.47 = 12,427.07/x
  3. Step 3: Cross multiply
    21,218.81x = 31,784.47 × 12,427.07
  4. Step 4: Simplify right side
    21,218.81x = 394,987,643.61
  5. Step 5: Solve for x
    x = 394,987,643.61/21,218.81
  6. Step 6: Final answer
    x = 18,614.98

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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.