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Finding the Fourth Proportional to 72,271.80, 108,407.70 and 19,681.20

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Solution

The fourth proportional to 72,271.80, 108,407.70 and 19,681.20 is: 29,521.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,271.80 : 108,407.70 = 19,681.20 : x
  2. Step 2: Convert to fraction form
    72,271.80/108,407.70 = 19,681.20/x
  3. Step 3: Cross multiply
    72,271.80x = 108,407.70 × 19,681.20
  4. Step 4: Simplify right side
    72,271.80x = 2,133,593,625.24
  5. Step 5: Solve for x
    x = 2,133,593,625.24/72,271.80
  6. Step 6: Final answer
    x = 29,521.80

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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.