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Finding the Fourth Proportional to 113,128.40, 169,692.60 and 86,965.20

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Solution

The fourth proportional to 113,128.40, 169,692.60 and 86,965.20 is: 130,447.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,128.40 : 169,692.60 = 86,965.20 : x
  2. Step 2: Convert to fraction form
    113,128.40/169,692.60 = 86,965.20/x
  3. Step 3: Cross multiply
    113,128.40x = 169,692.60 × 86,965.20
  4. Step 4: Simplify right side
    113,128.40x = 14,757,350,897.52
  5. Step 5: Solve for x
    x = 14,757,350,897.52/113,128.40
  6. Step 6: Final answer
    x = 130,447.80

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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.