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Finding the Fourth Proportional to 85,688.82, 128,309.67 and 68,957.46

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Solution

The fourth proportional to 85,688.82, 128,309.67 and 68,957.46 is: 103,256.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,688.82 : 128,309.67 = 68,957.46 : x
  2. Step 2: Convert to fraction form
    85,688.82/128,309.67 = 68,957.46/x
  3. Step 3: Cross multiply
    85,688.82x = 128,309.67 × 68,957.46
  4. Step 4: Simplify right side
    85,688.82x = 8,847,908,936.64
  5. Step 5: Solve for x
    x = 8,847,908,936.64/85,688.82
  6. Step 6: Final answer
    x = 103,256.28

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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.