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Finding the Fourth Proportional to 79,649.28, 109,678.74 and 77,881.26

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Solution

The fourth proportional to 79,649.28, 109,678.74 and 77,881.26 is: 107,244.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,649.28 : 109,678.74 = 77,881.26 : x
  2. Step 2: Convert to fraction form
    79,649.28/109,678.74 = 77,881.26/x
  3. Step 3: Cross multiply
    79,649.28x = 109,678.74 × 77,881.26
  4. Step 4: Simplify right side
    79,649.28x = 8,541,918,466.41
  5. Step 5: Solve for x
    x = 8,541,918,466.41/79,649.28
  6. Step 6: Final answer
    x = 107,244.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.