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Finding the Fourth Proportional to 700.66, 966.78 and 390.16

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Solution

The fourth proportional to 700.66, 966.78 and 390.16 is: 538.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.66 : 966.78 = 390.16 : x
  2. Step 2: Convert to fraction form
    700.66/966.78 = 390.16/x
  3. Step 3: Cross multiply
    700.66x = 966.78 × 390.16
  4. Step 4: Simplify right side
    700.66x = 377,198.88
  5. Step 5: Solve for x
    x = 377,198.88/700.66
  6. Step 6: Final answer
    x = 538.35

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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.