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Finding the Fourth Proportional to 213,760.80, 320,641.20 and 56,005.20

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Solution

The fourth proportional to 213,760.80, 320,641.20 and 56,005.20 is: 84,007.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,760.80 : 320,641.20 = 56,005.20 : x
  2. Step 2: Convert to fraction form
    213,760.80/320,641.20 = 56,005.20/x
  3. Step 3: Cross multiply
    213,760.80x = 320,641.20 × 56,005.20
  4. Step 4: Simplify right side
    213,760.80x = 17,957,574,534.24
  5. Step 5: Solve for x
    x = 17,957,574,534.24/213,760.80
  6. Step 6: Final answer
    x = 84,007.80

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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.