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Finding the Fourth Proportional to 78,915.65, 118,379.64 and 26,325.08

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Solution

The fourth proportional to 78,915.65, 118,379.64 and 26,325.08 is: 39,489.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,915.65 : 118,379.64 = 26,325.08 : x
  2. Step 2: Convert to fraction form
    78,915.65/118,379.64 = 26,325.08/x
  3. Step 3: Cross multiply
    78,915.65x = 118,379.64 × 26,325.08
  4. Step 4: Simplify right side
    78,915.65x = 3,116,353,493.37
  5. Step 5: Solve for x
    x = 3,116,353,493.37/78,915.65
  6. Step 6: Final answer
    x = 39,489.68

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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.