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Finding the Fourth Proportional to 1,074.40, 1,608.90 and 707.20

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Solution

The fourth proportional to 1,074.40, 1,608.90 and 707.20 is: 1,059.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.40 : 1,608.90 = 707.20 : x
  2. Step 2: Convert to fraction form
    1,074.40/1,608.90 = 707.20/x
  3. Step 3: Cross multiply
    1,074.40x = 1,608.90 × 707.20
  4. Step 4: Simplify right side
    1,074.40x = 1,137,814.08
  5. Step 5: Solve for x
    x = 1,137,814.08/1,074.40
  6. Step 6: Final answer
    x = 1,059.02

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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.