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Finding the Fourth Proportional to 787.32, 1,086.93 and 539.01

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Solution

The fourth proportional to 787.32, 1,086.93 and 539.01 is: 744.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.32 : 1,086.93 = 539.01 : x
  2. Step 2: Convert to fraction form
    787.32/1,086.93 = 539.01/x
  3. Step 3: Cross multiply
    787.32x = 1,086.93 × 539.01
  4. Step 4: Simplify right side
    787.32x = 585,866.14
  5. Step 5: Solve for x
    x = 585,866.14/787.32
  6. Step 6: Final answer
    x = 744.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.