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Finding the Fourth Proportional to 660.88, 912.02 and 428.41

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Solution

The fourth proportional to 660.88, 912.02 and 428.41 is: 591.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.88 : 912.02 = 428.41 : x
  2. Step 2: Convert to fraction form
    660.88/912.02 = 428.41/x
  3. Step 3: Cross multiply
    660.88x = 912.02 × 428.41
  4. Step 4: Simplify right side
    660.88x = 390,718.49
  5. Step 5: Solve for x
    x = 390,718.49/660.88
  6. Step 6: Final answer
    x = 591.21

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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.