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Finding the Fourth Proportional to 1,075.08, 1,611.18 and 613

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Solution

The fourth proportional to 1,075.08, 1,611.18 and 613 is: 918.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.08 : 1,611.18 = 613 : x
  2. Step 2: Convert to fraction form
    1,075.08/1,611.18 = 613/x
  3. Step 3: Cross multiply
    1,075.08x = 1,611.18 × 613
  4. Step 4: Simplify right side
    1,075.08x = 987,653.34
  5. Step 5: Solve for x
    x = 987,653.34/1,075.08
  6. Step 6: Final answer
    x = 918.68

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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.