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Finding the Fourth Proportional to 700.56, 966.72 and 390.12

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Solution

The fourth proportional to 700.56, 966.72 and 390.12 is: 538.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.56 : 966.72 = 390.12 : x
  2. Step 2: Convert to fraction form
    700.56/966.72 = 390.12/x
  3. Step 3: Cross multiply
    700.56x = 966.72 × 390.12
  4. Step 4: Simplify right side
    700.56x = 377,136.81
  5. Step 5: Solve for x
    x = 377,136.81/700.56
  6. Step 6: Final answer
    x = 538.34

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Half scale
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Double scale
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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.