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Finding the Fourth Proportional to 1,075.14, 1,613.34 and 425.79

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Solution

The fourth proportional to 1,075.14, 1,613.34 and 425.79 is: 638.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.14 : 1,613.34 = 425.79 : x
  2. Step 2: Convert to fraction form
    1,075.14/1,613.34 = 425.79/x
  3. Step 3: Cross multiply
    1,075.14x = 1,613.34 × 425.79
  4. Step 4: Simplify right side
    1,075.14x = 686,944.04
  5. Step 5: Solve for x
    x = 686,944.04/1,075.14
  6. Step 6: Final answer
    x = 638.93

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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.