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Finding the Fourth Proportional to 78,369.90, 117,503.73 and 28,440.54

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Solution

The fourth proportional to 78,369.90, 117,503.73 and 28,440.54 is: 42,642.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,369.90 : 117,503.73 = 28,440.54 : x
  2. Step 2: Convert to fraction form
    78,369.90/117,503.73 = 28,440.54/x
  3. Step 3: Cross multiply
    78,369.90x = 117,503.73 × 28,440.54
  4. Step 4: Simplify right side
    78,369.90x = 3,341,869,533.21
  5. Step 5: Solve for x
    x = 3,341,869,533.21/78,369.90
  6. Step 6: Final answer
    x = 42,642.26

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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.