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Finding the Fourth Proportional to 78,920.16, 118,369.44 and 26,328.48

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Solution

The fourth proportional to 78,920.16, 118,369.44 and 26,328.48 is: 39,489.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,920.16 : 118,369.44 = 26,328.48 : x
  2. Step 2: Convert to fraction form
    78,920.16/118,369.44 = 26,328.48/x
  3. Step 3: Cross multiply
    78,920.16x = 118,369.44 × 26,328.48
  4. Step 4: Simplify right side
    78,920.16x = 3,116,487,433.65
  5. Step 5: Solve for x
    x = 3,116,487,433.65/78,920.16
  6. Step 6: Final answer
    x = 39,489.12

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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.