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Finding the Fourth Proportional to 1,054.58, 1,579.84 and 642.49

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Solution

The fourth proportional to 1,054.58, 1,579.84 and 642.49 is: 962.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,054.58 : 1,579.84 = 642.49 : x
  2. Step 2: Convert to fraction form
    1,054.58/1,579.84 = 642.49/x
  3. Step 3: Cross multiply
    1,054.58x = 1,579.84 × 642.49
  4. Step 4: Simplify right side
    1,054.58x = 1,015,025.85
  5. Step 5: Solve for x
    x = 1,015,025.85/1,054.58
  6. Step 6: Final answer
    x = 962.50

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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.