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Finding the Fourth Proportional to 85,787.78, 128,539.40 and 60,703.50

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Solution

The fourth proportional to 85,787.78, 128,539.40 and 60,703.50 is: 90,954.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,787.78 : 128,539.40 = 60,703.50 : x
  2. Step 2: Convert to fraction form
    85,787.78/128,539.40 = 60,703.50/x
  3. Step 3: Cross multiply
    85,787.78x = 128,539.40 × 60,703.50
  4. Step 4: Simplify right side
    85,787.78x = 7,802,791,467.90
  5. Step 5: Solve for x
    x = 7,802,791,467.90/85,787.78
  6. Step 6: Final answer
    x = 90,954.58

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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.