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Finding the Fourth Proportional to 1,075.76, 1,614.58 and 613.76

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Solution

The fourth proportional to 1,075.76, 1,614.58 and 613.76 is: 921.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.76 : 1,614.58 = 613.76 : x
  2. Step 2: Convert to fraction form
    1,075.76/1,614.58 = 613.76/x
  3. Step 3: Cross multiply
    1,075.76x = 1,614.58 × 613.76
  4. Step 4: Simplify right side
    1,075.76x = 990,964.62
  5. Step 5: Solve for x
    x = 990,964.62/1,075.76
  6. Step 6: Final answer
    x = 921.18

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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.