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Finding the Fourth Proportional to 1,075.45, 1,613.42 and 345.10

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Solution

The fourth proportional to 1,075.45, 1,613.42 and 345.10 is: 517.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.45 : 1,613.42 = 345.10 : x
  2. Step 2: Convert to fraction form
    1,075.45/1,613.42 = 345.10/x
  3. Step 3: Cross multiply
    1,075.45x = 1,613.42 × 345.10
  4. Step 4: Simplify right side
    1,075.45x = 556,791.24
  5. Step 5: Solve for x
    x = 556,791.24/1,075.45
  6. Step 6: Final answer
    x = 517.73

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Double scale
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1.5x scale

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.