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Finding the Fourth Proportional to 783.08, 1,080.54 and 658.42

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Solution

The fourth proportional to 783.08, 1,080.54 and 658.42 is: 908.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.08 : 1,080.54 = 658.42 : x
  2. Step 2: Convert to fraction form
    783.08/1,080.54 = 658.42/x
  3. Step 3: Cross multiply
    783.08x = 1,080.54 × 658.42
  4. Step 4: Simplify right side
    783.08x = 711,449.15
  5. Step 5: Solve for x
    x = 711,449.15/783.08
  6. Step 6: Final answer
    x = 908.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.