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Finding the Fourth Proportional to 85,678.70, 128,294.48 and 68,947.34

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Solution

The fourth proportional to 85,678.70, 128,294.48 and 68,947.34 is: 103,241.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,678.70 : 128,294.48 = 68,947.34 : x
  2. Step 2: Convert to fraction form
    85,678.70/128,294.48 = 68,947.34/x
  3. Step 3: Cross multiply
    85,678.70x = 128,294.48 × 68,947.34
  4. Step 4: Simplify right side
    85,678.70x = 8,845,562,663.58
  5. Step 5: Solve for x
    x = 8,845,562,663.58/85,678.70
  6. Step 6: Final answer
    x = 103,241.10

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1.5x scale

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.