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Finding the Fourth Proportional to 117,712.80, 176,655.60 and 78,256.80

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Solution

The fourth proportional to 117,712.80, 176,655.60 and 78,256.80 is: 117,442.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    117,712.80 : 176,655.60 = 78,256.80 : x
  2. Step 2: Convert to fraction form
    117,712.80/176,655.60 = 78,256.80/x
  3. Step 3: Cross multiply
    117,712.80x = 176,655.60 × 78,256.80
  4. Step 4: Simplify right side
    117,712.80x = 13,824,501,958.08
  5. Step 5: Solve for x
    x = 13,824,501,958.08/117,712.80
  6. Step 6: Final answer
    x = 117,442.64

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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.