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Finding the Fourth Proportional to 992.16, 1,369.68 and 661.12

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Solution

The fourth proportional to 992.16, 1,369.68 and 661.12 is: 912.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.16 : 1,369.68 = 661.12 : x
  2. Step 2: Convert to fraction form
    992.16/1,369.68 = 661.12/x
  3. Step 3: Cross multiply
    992.16x = 1,369.68 × 661.12
  4. Step 4: Simplify right side
    992.16x = 905,522.84
  5. Step 5: Solve for x
    x = 905,522.84/992.16
  6. Step 6: Final answer
    x = 912.68

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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.