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Finding the Fourth Proportional to 21,240.04, 31,866.46 and 7,389

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Solution

The fourth proportional to 21,240.04, 31,866.46 and 7,389 is: 11,085.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,240.04 : 31,866.46 = 7,389 : x
  2. Step 2: Convert to fraction form
    21,240.04/31,866.46 = 7,389/x
  3. Step 3: Cross multiply
    21,240.04x = 31,866.46 × 7,389
  4. Step 4: Simplify right side
    21,240.04x = 235,461,272.94
  5. Step 5: Solve for x
    x = 235,461,272.94/21,240.04
  6. Step 6: Final answer
    x = 11,085.73

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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.