Home / 20,688.39-31,035.40-6,643.76

Finding the Fourth Proportional to 20,688.39, 31,035.40 and 6,643.76

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Solution

The fourth proportional to 20,688.39, 31,035.40 and 6,643.76 is: 9,966.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.39 : 31,035.40 = 6,643.76 : x
  2. Step 2: Convert to fraction form
    20,688.39/31,035.40 = 6,643.76/x
  3. Step 3: Cross multiply
    20,688.39x = 31,035.40 × 6,643.76
  4. Step 4: Simplify right side
    20,688.39x = 206,191,577.32
  5. Step 5: Solve for x
    x = 206,191,577.32/20,688.39
  6. Step 6: Final answer
    x = 9,966.54

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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.