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Finding the Fourth Proportional to 949.55, 1,424.78 and 386.64

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Solution

The fourth proportional to 949.55, 1,424.78 and 386.64 is: 580.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.55 : 1,424.78 = 386.64 : x
  2. Step 2: Convert to fraction form
    949.55/1,424.78 = 386.64/x
  3. Step 3: Cross multiply
    949.55x = 1,424.78 × 386.64
  4. Step 4: Simplify right side
    949.55x = 550,875.01
  5. Step 5: Solve for x
    x = 550,875.01/949.55
  6. Step 6: Final answer
    x = 580.15

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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.