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Finding the Fourth Proportional to 1,271.79, 1,906.47 and 621.81

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Solution

The fourth proportional to 1,271.79, 1,906.47 and 621.81 is: 932.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.79 : 1,906.47 = 621.81 : x
  2. Step 2: Convert to fraction form
    1,271.79/1,906.47 = 621.81/x
  3. Step 3: Cross multiply
    1,271.79x = 1,906.47 × 621.81
  4. Step 4: Simplify right side
    1,271.79x = 1,185,462.11
  5. Step 5: Solve for x
    x = 1,185,462.11/1,271.79
  6. Step 6: Final answer
    x = 932.12

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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.