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Finding the Fourth Proportional to 2,658.90, 3,988.35 and 711.30

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Solution

The fourth proportional to 2,658.90, 3,988.35 and 711.30 is: 1,066.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,658.90 : 3,988.35 = 711.30 : x
  2. Step 2: Convert to fraction form
    2,658.90/3,988.35 = 711.30/x
  3. Step 3: Cross multiply
    2,658.90x = 3,988.35 × 711.30
  4. Step 4: Simplify right side
    2,658.90x = 2,836,913.36
  5. Step 5: Solve for x
    x = 2,836,913.36/2,658.90
  6. Step 6: Final answer
    x = 1,066.95

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Similar ratio
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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.