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Finding the Fourth Proportional to 21,456.70, 32,271.45 and 19,210.30

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Solution

The fourth proportional to 21,456.70, 32,271.45 and 19,210.30 is: 28,892.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,456.70 : 32,271.45 = 19,210.30 : x
  2. Step 2: Convert to fraction form
    21,456.70/32,271.45 = 19,210.30/x
  3. Step 3: Cross multiply
    21,456.70x = 32,271.45 × 19,210.30
  4. Step 4: Simplify right side
    21,456.70x = 619,944,235.94
  5. Step 5: Solve for x
    x = 619,944,235.94/21,456.70
  6. Step 6: Final answer
    x = 28,892.80

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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.