Home / 21,319.40-31,982-7,275.65

Finding the Fourth Proportional to 21,319.40, 31,982 and 7,275.65

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Solution

The fourth proportional to 21,319.40, 31,982 and 7,275.65 is: 10,914.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,319.40 : 31,982 = 7,275.65 : x
  2. Step 2: Convert to fraction form
    21,319.40/31,982 = 7,275.65/x
  3. Step 3: Cross multiply
    21,319.40x = 31,982 × 7,275.65
  4. Step 4: Simplify right side
    21,319.40x = 232,689,838.30
  5. Step 5: Solve for x
    x = 232,689,838.30/21,319.40
  6. Step 6: Final answer
    x = 10,914.46

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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.