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Finding the Fourth Proportional to 949.77, 1,421.55 and 656.55

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Solution

The fourth proportional to 949.77, 1,421.55 and 656.55 is: 982.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.77 : 1,421.55 = 656.55 : x
  2. Step 2: Convert to fraction form
    949.77/1,421.55 = 656.55/x
  3. Step 3: Cross multiply
    949.77x = 1,421.55 × 656.55
  4. Step 4: Simplify right side
    949.77x = 933,318.65
  5. Step 5: Solve for x
    x = 933,318.65/949.77
  6. Step 6: Final answer
    x = 982.68

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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.