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Finding the Fourth Proportional to 737.69, 1,106.51 and 428.58

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Solution

The fourth proportional to 737.69, 1,106.51 and 428.58 is: 642.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    737.69 : 1,106.51 = 428.58 : x
  2. Step 2: Convert to fraction form
    737.69/1,106.51 = 428.58/x
  3. Step 3: Cross multiply
    737.69x = 1,106.51 × 428.58
  4. Step 4: Simplify right side
    737.69x = 474,225.91
  5. Step 5: Solve for x
    x = 474,225.91/737.69
  6. Step 6: Final answer
    x = 642.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.