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Finding the Fourth Proportional to 78,482.42, 117,706.98 and 25,879.40

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Solution

The fourth proportional to 78,482.42, 117,706.98 and 25,879.40 is: 38,813.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,482.42 : 117,706.98 = 25,879.40 : x
  2. Step 2: Convert to fraction form
    78,482.42/117,706.98 = 25,879.40/x
  3. Step 3: Cross multiply
    78,482.42x = 117,706.98 × 25,879.40
  4. Step 4: Simplify right side
    78,482.42x = 3,046,186,018.21
  5. Step 5: Solve for x
    x = 3,046,186,018.21/78,482.42
  6. Step 6: Final answer
    x = 38,813.61

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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.