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Finding the Fourth Proportional to 700.86, 966.96 and 421.05

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Solution

The fourth proportional to 700.86, 966.96 and 421.05 is: 580.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.86 : 966.96 = 421.05 : x
  2. Step 2: Convert to fraction form
    700.86/966.96 = 421.05/x
  3. Step 3: Cross multiply
    700.86x = 966.96 × 421.05
  4. Step 4: Simplify right side
    700.86x = 407,138.51
  5. Step 5: Solve for x
    x = 407,138.51/700.86
  6. Step 6: Final answer
    x = 580.91

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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.