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Finding the Fourth Proportional to 1,075.48, 1,613.37 and 345.21

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Solution

The fourth proportional to 1,075.48, 1,613.37 and 345.21 is: 517.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.48 : 1,613.37 = 345.21 : x
  2. Step 2: Convert to fraction form
    1,075.48/1,613.37 = 345.21/x
  3. Step 3: Cross multiply
    1,075.48x = 1,613.37 × 345.21
  4. Step 4: Simplify right side
    1,075.48x = 556,953.84
  5. Step 5: Solve for x
    x = 556,953.84/1,075.48
  6. Step 6: Final answer
    x = 517.87

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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.