Home / 20,816.79-31,237.40-7,678.32

Finding the Fourth Proportional to 20,816.79, 31,237.40 and 7,678.32

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Solution

The fourth proportional to 20,816.79, 31,237.40 and 7,678.32 is: 11,521.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,816.79 : 31,237.40 = 7,678.32 : x
  2. Step 2: Convert to fraction form
    20,816.79/31,237.40 = 7,678.32/x
  3. Step 3: Cross multiply
    20,816.79x = 31,237.40 × 7,678.32
  4. Step 4: Simplify right side
    20,816.79x = 239,850,753.17
  5. Step 5: Solve for x
    x = 239,850,753.17/20,816.79
  6. Step 6: Final answer
    x = 11,521.99

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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.