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Finding the Fourth Proportional to 1,075.76, 1,612.92 and 642.68

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Solution

The fourth proportional to 1,075.76, 1,612.92 and 642.68 is: 963.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.76 : 1,612.92 = 642.68 : x
  2. Step 2: Convert to fraction form
    1,075.76/1,612.92 = 642.68/x
  3. Step 3: Cross multiply
    1,075.76x = 1,612.92 × 642.68
  4. Step 4: Simplify right side
    1,075.76x = 1,036,591.43
  5. Step 5: Solve for x
    x = 1,036,591.43/1,075.76
  6. Step 6: Final answer
    x = 963.59

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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.