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Finding the Fourth Proportional to 85,368.98, 128,118.81 and 38,654.66

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Solution

The fourth proportional to 85,368.98, 128,118.81 and 38,654.66 is: 58,011.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,368.98 : 128,118.81 = 38,654.66 : x
  2. Step 2: Convert to fraction form
    85,368.98/128,118.81 = 38,654.66/x
  3. Step 3: Cross multiply
    85,368.98x = 128,118.81 × 38,654.66
  4. Step 4: Simplify right side
    85,368.98x = 4,952,389,040.15
  5. Step 5: Solve for x
    x = 4,952,389,040.15/85,368.98
  6. Step 6: Final answer
    x = 58,011.58

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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.