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Finding the Fourth Proportional to 87,391, 131,075.34 and 28,220.50

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Solution

The fourth proportional to 87,391, 131,075.34 and 28,220.50 is: 42,327.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,391 : 131,075.34 = 28,220.50 : x
  2. Step 2: Convert to fraction form
    87,391/131,075.34 = 28,220.50/x
  3. Step 3: Cross multiply
    87,391x = 131,075.34 × 28,220.50
  4. Step 4: Simplify right side
    87,391x = 3,699,011,632.47
  5. Step 5: Solve for x
    x = 3,699,011,632.47/87,391
  6. Step 6: Final answer
    x = 42,327.15

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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.