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Finding the Fourth Proportional to 56,859.21, 78,369.35 and 39,868.65

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Solution

The fourth proportional to 56,859.21, 78,369.35 and 39,868.65 is: 54,951.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,859.21 : 78,369.35 = 39,868.65 : x
  2. Step 2: Convert to fraction form
    56,859.21/78,369.35 = 39,868.65/x
  3. Step 3: Cross multiply
    56,859.21x = 78,369.35 × 39,868.65
  4. Step 4: Simplify right side
    56,859.21x = 3,124,479,986.53
  5. Step 5: Solve for x
    x = 3,124,479,986.53/56,859.21
  6. Step 6: Final answer
    x = 54,951.17

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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.