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Finding the Fourth Proportional to 139,381.65, 192,337.20 and 75,718.08

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Solution

The fourth proportional to 139,381.65, 192,337.20 and 75,718.08 is: 104,485.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,381.65 : 192,337.20 = 75,718.08 : x
  2. Step 2: Convert to fraction form
    139,381.65/192,337.20 = 75,718.08/x
  3. Step 3: Cross multiply
    139,381.65x = 192,337.20 × 75,718.08
  4. Step 4: Simplify right side
    139,381.65x = 14,563,403,496.58
  5. Step 5: Solve for x
    x = 14,563,403,496.58/139,381.65
  6. Step 6: Final answer
    x = 104,485.80

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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.