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Finding the Fourth Proportional to 1,008.48, 1,390.23 and 708.81

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Solution

The fourth proportional to 1,008.48, 1,390.23 and 708.81 is: 977.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.48 : 1,390.23 = 708.81 : x
  2. Step 2: Convert to fraction form
    1,008.48/1,390.23 = 708.81/x
  3. Step 3: Cross multiply
    1,008.48x = 1,390.23 × 708.81
  4. Step 4: Simplify right side
    1,008.48x = 985,408.93
  5. Step 5: Solve for x
    x = 985,408.93/1,008.48
  6. Step 6: Final answer
    x = 977.12

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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.