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Finding the Fourth Proportional to 700.63, 966.93 and 390.19

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Solution

The fourth proportional to 700.63, 966.93 and 390.19 is: 538.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.63 : 966.93 = 390.19 : x
  2. Step 2: Convert to fraction form
    700.63/966.93 = 390.19/x
  3. Step 3: Cross multiply
    700.63x = 966.93 × 390.19
  4. Step 4: Simplify right side
    700.63x = 377,286.42
  5. Step 5: Solve for x
    x = 377,286.42/700.63
  6. Step 6: Final answer
    x = 538.50

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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.