Home / 21,240-31,856.42-6,445.35

Finding the Fourth Proportional to 21,240, 31,856.42 and 6,445.35

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Solution

The fourth proportional to 21,240, 31,856.42 and 6,445.35 is: 9,666.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,240 : 31,856.42 = 6,445.35 : x
  2. Step 2: Convert to fraction form
    21,240/31,856.42 = 6,445.35/x
  3. Step 3: Cross multiply
    21,240x = 31,856.42 × 6,445.35
  4. Step 4: Simplify right side
    21,240x = 205,325,744.42
  5. Step 5: Solve for x
    x = 205,325,744.42/21,240
  6. Step 6: Final answer
    x = 9,666.94

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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.