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Finding the Fourth Proportional to 92,859.20, 139,288.80 and 86,954.30

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Solution

The fourth proportional to 92,859.20, 139,288.80 and 86,954.30 is: 130,431.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,859.20 : 139,288.80 = 86,954.30 : x
  2. Step 2: Convert to fraction form
    92,859.20/139,288.80 = 86,954.30/x
  3. Step 3: Cross multiply
    92,859.20x = 139,288.80 × 86,954.30
  4. Step 4: Simplify right side
    92,859.20x = 12,111,760,101.84
  5. Step 5: Solve for x
    x = 12,111,760,101.84/92,859.20
  6. Step 6: Final answer
    x = 130,431.45

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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.