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Finding the Fourth Proportional to 1,075.10, 1,612.67 and 425.84

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Solution

The fourth proportional to 1,075.10, 1,612.67 and 425.84 is: 638.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.10 : 1,612.67 = 425.84 : x
  2. Step 2: Convert to fraction form
    1,075.10/1,612.67 = 425.84/x
  3. Step 3: Cross multiply
    1,075.10x = 1,612.67 × 425.84
  4. Step 4: Simplify right side
    1,075.10x = 686,729.20
  5. Step 5: Solve for x
    x = 686,729.20/1,075.10
  6. Step 6: Final answer
    x = 638.76

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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.