Home / 20,821.87-31,210.93-7,665.85

Finding the Fourth Proportional to 20,821.87, 31,210.93 and 7,665.85

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Solution

The fourth proportional to 20,821.87, 31,210.93 and 7,665.85 is: 11,490.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.87 : 31,210.93 = 7,665.85 : x
  2. Step 2: Convert to fraction form
    20,821.87/31,210.93 = 7,665.85/x
  3. Step 3: Cross multiply
    20,821.87x = 31,210.93 × 7,665.85
  4. Step 4: Simplify right side
    20,821.87x = 239,258,307.74
  5. Step 5: Solve for x
    x = 239,258,307.74/20,821.87
  6. Step 6: Final answer
    x = 11,490.72

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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.