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Finding the Fourth Proportional to 87,351.28, 120,509.76 and 55,075.28

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Solution

The fourth proportional to 87,351.28, 120,509.76 and 55,075.28 is: 75,981.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,351.28 : 120,509.76 = 55,075.28 : x
  2. Step 2: Convert to fraction form
    87,351.28/120,509.76 = 55,075.28/x
  3. Step 3: Cross multiply
    87,351.28x = 120,509.76 × 55,075.28
  4. Step 4: Simplify right side
    87,351.28x = 6,637,108,774.73
  5. Step 5: Solve for x
    x = 6,637,108,774.73/87,351.28
  6. Step 6: Final answer
    x = 75,981.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.