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Finding the Fourth Proportional to 78,649.80, 117,380.51 and 73,316.93

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Solution

The fourth proportional to 78,649.80, 117,380.51 and 73,316.93 is: 109,421.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,649.80 : 117,380.51 = 73,316.93 : x
  2. Step 2: Convert to fraction form
    78,649.80/117,380.51 = 73,316.93/x
  3. Step 3: Cross multiply
    78,649.80x = 117,380.51 × 73,316.93
  4. Step 4: Simplify right side
    78,649.80x = 8,605,978,616.75
  5. Step 5: Solve for x
    x = 8,605,978,616.75/78,649.80
  6. Step 6: Final answer
    x = 109,421.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.