Home / 20,929.83-31,392.32-7,780.70

Finding the Fourth Proportional to 20,929.83, 31,392.32 and 7,780.70

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Solution

The fourth proportional to 20,929.83, 31,392.32 and 7,780.70 is: 11,670.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.83 : 31,392.32 = 7,780.70 : x
  2. Step 2: Convert to fraction form
    20,929.83/31,392.32 = 7,780.70/x
  3. Step 3: Cross multiply
    20,929.83x = 31,392.32 × 7,780.70
  4. Step 4: Simplify right side
    20,929.83x = 244,254,028.36
  5. Step 5: Solve for x
    x = 244,254,028.36/20,929.83
  6. Step 6: Final answer
    x = 11,670.14

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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.