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Finding the Fourth Proportional to 85,718.93, 128,703.23 and 63,298.78

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Solution

The fourth proportional to 85,718.93, 128,703.23 and 63,298.78 is: 95,040.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,718.93 : 128,703.23 = 63,298.78 : x
  2. Step 2: Convert to fraction form
    85,718.93/128,703.23 = 63,298.78/x
  3. Step 3: Cross multiply
    85,718.93x = 128,703.23 × 63,298.78
  4. Step 4: Simplify right side
    85,718.93x = 8,146,757,764.13
  5. Step 5: Solve for x
    x = 8,146,757,764.13/85,718.93
  6. Step 6: Final answer
    x = 95,040.36

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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.