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Finding the Fourth Proportional to 85,787.80, 128,539.40 and 60,703.48

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Solution

The fourth proportional to 85,787.80, 128,539.40 and 60,703.48 is: 90,954.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,787.80 : 128,539.40 = 60,703.48 : x
  2. Step 2: Convert to fraction form
    85,787.80/128,539.40 = 60,703.48/x
  3. Step 3: Cross multiply
    85,787.80x = 128,539.40 × 60,703.48
  4. Step 4: Simplify right side
    85,787.80x = 7,802,788,897.11
  5. Step 5: Solve for x
    x = 7,802,788,897.11/85,787.80
  6. Step 6: Final answer
    x = 90,954.53

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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.