Home / 20,869.76-31,320.16-12,983.74

Finding the Fourth Proportional to 20,869.76, 31,320.16 and 12,983.74

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Solution

The fourth proportional to 20,869.76, 31,320.16 and 12,983.74 is: 19,485.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,869.76 : 31,320.16 = 12,983.74 : x
  2. Step 2: Convert to fraction form
    20,869.76/31,320.16 = 12,983.74/x
  3. Step 3: Cross multiply
    20,869.76x = 31,320.16 × 12,983.74
  4. Step 4: Simplify right side
    20,869.76x = 406,652,703.44
  5. Step 5: Solve for x
    x = 406,652,703.44/20,869.76
  6. Step 6: Final answer
    x = 19,485.26

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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.