Home / 20,690.50-31,041.87-11,931.70

Finding the Fourth Proportional to 20,690.50, 31,041.87 and 11,931.70

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Solution

The fourth proportional to 20,690.50, 31,041.87 and 11,931.70 is: 17,901.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.50 : 31,041.87 = 11,931.70 : x
  2. Step 2: Convert to fraction form
    20,690.50/31,041.87 = 11,931.70/x
  3. Step 3: Cross multiply
    20,690.50x = 31,041.87 × 11,931.70
  4. Step 4: Simplify right side
    20,690.50x = 370,382,280.28
  5. Step 5: Solve for x
    x = 370,382,280.28/20,690.50
  6. Step 6: Final answer
    x = 17,901.08

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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.