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Finding the Fourth Proportional to 1,075.86, 1,613.70 and 426.63

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Solution

The fourth proportional to 1,075.86, 1,613.70 and 426.63 is: 639.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.86 : 1,613.70 = 426.63 : x
  2. Step 2: Convert to fraction form
    1,075.86/1,613.70 = 426.63/x
  3. Step 3: Cross multiply
    1,075.86x = 1,613.70 × 426.63
  4. Step 4: Simplify right side
    1,075.86x = 688,452.83
  5. Step 5: Solve for x
    x = 688,452.83/1,075.86
  6. Step 6: Final answer
    x = 639.91

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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.