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Finding the Fourth Proportional to 1,074.36, 1,613.60 and 666.35

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Solution

The fourth proportional to 1,074.36, 1,613.60 and 666.35 is: 1,000.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.36 : 1,613.60 = 666.35 : x
  2. Step 2: Convert to fraction form
    1,074.36/1,613.60 = 666.35/x
  3. Step 3: Cross multiply
    1,074.36x = 1,613.60 × 666.35
  4. Step 4: Simplify right side
    1,074.36x = 1,075,222.17
  5. Step 5: Solve for x
    x = 1,075,222.17/1,074.36
  6. Step 6: Final answer
    x = 1,000.80

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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.