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Finding the Fourth Proportional to 85,021.68, 128,099.76 and 77,026.44

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Solution

The fourth proportional to 85,021.68, 128,099.76 and 77,026.44 is: 116,053.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,021.68 : 128,099.76 = 77,026.44 : x
  2. Step 2: Convert to fraction form
    85,021.68/128,099.76 = 77,026.44/x
  3. Step 3: Cross multiply
    85,021.68x = 128,099.76 × 77,026.44
  4. Step 4: Simplify right side
    85,021.68x = 9,867,068,477.65
  5. Step 5: Solve for x
    x = 9,867,068,477.65/85,021.68
  6. Step 6: Final answer
    x = 116,053.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.