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Finding the Fourth Proportional to 60,699.20, 91,048.80 and 21,243.20

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Solution

The fourth proportional to 60,699.20, 91,048.80 and 21,243.20 is: 31,864.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,699.20 : 91,048.80 = 21,243.20 : x
  2. Step 2: Convert to fraction form
    60,699.20/91,048.80 = 21,243.20/x
  3. Step 3: Cross multiply
    60,699.20x = 91,048.80 × 21,243.20
  4. Step 4: Simplify right side
    60,699.20x = 1,934,167,868.16
  5. Step 5: Solve for x
    x = 1,934,167,868.16/60,699.20
  6. Step 6: Final answer
    x = 31,864.80

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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.