Home / 20,681.84-31,004.76-13,288.40

Finding the Fourth Proportional to 20,681.84, 31,004.76 and 13,288.40

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Solution

The fourth proportional to 20,681.84, 31,004.76 and 13,288.40 is: 19,921.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.84 : 31,004.76 = 13,288.40 : x
  2. Step 2: Convert to fraction form
    20,681.84/31,004.76 = 13,288.40/x
  3. Step 3: Cross multiply
    20,681.84x = 31,004.76 × 13,288.40
  4. Step 4: Simplify right side
    20,681.84x = 412,003,652.78
  5. Step 5: Solve for x
    x = 412,003,652.78/20,681.84
  6. Step 6: Final answer
    x = 19,921.03

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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.