Home / 20,987.10-31,480.65-12,692.70

Finding the Fourth Proportional to 20,987.10, 31,480.65 and 12,692.70

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Solution

The fourth proportional to 20,987.10, 31,480.65 and 12,692.70 is: 19,039.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.10 : 31,480.65 = 12,692.70 : x
  2. Step 2: Convert to fraction form
    20,987.10/31,480.65 = 12,692.70/x
  3. Step 3: Cross multiply
    20,987.10x = 31,480.65 × 12,692.70
  4. Step 4: Simplify right side
    20,987.10x = 399,574,446.26
  5. Step 5: Solve for x
    x = 399,574,446.26/20,987.10
  6. Step 6: Final answer
    x = 19,039.05

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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.