Home / 20,801.80-31,202.70-12,507.40

Finding the Fourth Proportional to 20,801.80, 31,202.70 and 12,507.40

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Solution

The fourth proportional to 20,801.80, 31,202.70 and 12,507.40 is: 18,761.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,801.80 : 31,202.70 = 12,507.40 : x
  2. Step 2: Convert to fraction form
    20,801.80/31,202.70 = 12,507.40/x
  3. Step 3: Cross multiply
    20,801.80x = 31,202.70 × 12,507.40
  4. Step 4: Simplify right side
    20,801.80x = 390,264,649.98
  5. Step 5: Solve for x
    x = 390,264,649.98/20,801.80
  6. Step 6: Final answer
    x = 18,761.10

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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.