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Finding the Fourth Proportional to 31,988.80, 47,983.20 and 21,491.20

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Solution

The fourth proportional to 31,988.80, 47,983.20 and 21,491.20 is: 32,236.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,988.80 : 47,983.20 = 21,491.20 : x
  2. Step 2: Convert to fraction form
    31,988.80/47,983.20 = 21,491.20/x
  3. Step 3: Cross multiply
    31,988.80x = 47,983.20 × 21,491.20
  4. Step 4: Simplify right side
    31,988.80x = 1,031,216,547.84
  5. Step 5: Solve for x
    x = 1,031,216,547.84/31,988.80
  6. Step 6: Final answer
    x = 32,236.80

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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.