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Finding the Fourth Proportional to 87,351.78, 120,510.45 and 55,075.78

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Solution

The fourth proportional to 87,351.78, 120,510.45 and 55,075.78 is: 75,982.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,351.78 : 120,510.45 = 55,075.78 : x
  2. Step 2: Convert to fraction form
    87,351.78/120,510.45 = 55,075.78/x
  3. Step 3: Cross multiply
    87,351.78x = 120,510.45 × 55,075.78
  4. Step 4: Simplify right side
    87,351.78x = 6,637,207,031.90
  5. Step 5: Solve for x
    x = 6,637,207,031.90/87,351.78
  6. Step 6: Final answer
    x = 75,982.50

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1.5x scale

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.