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Finding the Fourth Proportional to 992.79, 1,370.12 and 550.74

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Solution

The fourth proportional to 992.79, 1,370.12 and 550.74 is: 760.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.79 : 1,370.12 = 550.74 : x
  2. Step 2: Convert to fraction form
    992.79/1,370.12 = 550.74/x
  3. Step 3: Cross multiply
    992.79x = 1,370.12 × 550.74
  4. Step 4: Simplify right side
    992.79x = 754,574.42
  5. Step 5: Solve for x
    x = 754,574.42/992.79
  6. Step 6: Final answer
    x = 760.05

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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.