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Finding the Fourth Proportional to 85,460.34, 128,065.77 and 60,486.84

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Solution

The fourth proportional to 85,460.34, 128,065.77 and 60,486.84 is: 90,641.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,460.34 : 128,065.77 = 60,486.84 : x
  2. Step 2: Convert to fraction form
    85,460.34/128,065.77 = 60,486.84/x
  3. Step 3: Cross multiply
    85,460.34x = 128,065.77 × 60,486.84
  4. Step 4: Simplify right side
    85,460.34x = 7,746,293,739.47
  5. Step 5: Solve for x
    x = 7,746,293,739.47/85,460.34
  6. Step 6: Final answer
    x = 90,641.97

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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.