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Finding the Fourth Proportional to 1,071.09, 1,606.70 and 421.81

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Solution

The fourth proportional to 1,071.09, 1,606.70 and 421.81 is: 632.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.09 : 1,606.70 = 421.81 : x
  2. Step 2: Convert to fraction form
    1,071.09/1,606.70 = 421.81/x
  3. Step 3: Cross multiply
    1,071.09x = 1,606.70 × 421.81
  4. Step 4: Simplify right side
    1,071.09x = 677,719.16
  5. Step 5: Solve for x
    x = 677,719.16/1,071.09
  6. Step 6: Final answer
    x = 632.74

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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.