Home / 20,918.44-31,384.86-13,118.12

Finding the Fourth Proportional to 20,918.44, 31,384.86 and 13,118.12

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Solution

The fourth proportional to 20,918.44, 31,384.86 and 13,118.12 is: 19,681.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.44 : 31,384.86 = 13,118.12 : x
  2. Step 2: Convert to fraction form
    20,918.44/31,384.86 = 13,118.12/x
  3. Step 3: Cross multiply
    20,918.44x = 31,384.86 × 13,118.12
  4. Step 4: Simplify right side
    20,918.44x = 411,710,359.66
  5. Step 5: Solve for x
    x = 411,710,359.66/20,918.44
  6. Step 6: Final answer
    x = 19,681.70

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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.