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Finding the Fourth Proportional to 85,655.86, 128,510.06 and 38,310.77

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Solution

The fourth proportional to 85,655.86, 128,510.06 and 38,310.77 is: 57,477.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,655.86 : 128,510.06 = 38,310.77 : x
  2. Step 2: Convert to fraction form
    85,655.86/128,510.06 = 38,310.77/x
  3. Step 3: Cross multiply
    85,655.86x = 128,510.06 × 38,310.77
  4. Step 4: Simplify right side
    85,655.86x = 4,923,319,351.35
  5. Step 5: Solve for x
    x = 4,923,319,351.35/85,655.86
  6. Step 6: Final answer
    x = 57,477.90

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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.