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Finding the Fourth Proportional to 660.74, 912.23 and 424.79

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Solution

The fourth proportional to 660.74, 912.23 and 424.79 is: 586.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.74 : 912.23 = 424.79 : x
  2. Step 2: Convert to fraction form
    660.74/912.23 = 424.79/x
  3. Step 3: Cross multiply
    660.74x = 912.23 × 424.79
  4. Step 4: Simplify right side
    660.74x = 387,504.51
  5. Step 5: Solve for x
    x = 387,504.51/660.74
  6. Step 6: Final answer
    x = 586.47

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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.