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Finding the Fourth Proportional to 753.02, 1,128.58 and 428.57

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Solution

The fourth proportional to 753.02, 1,128.58 and 428.57 is: 642.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.02 : 1,128.58 = 428.57 : x
  2. Step 2: Convert to fraction form
    753.02/1,128.58 = 428.57/x
  3. Step 3: Cross multiply
    753.02x = 1,128.58 × 428.57
  4. Step 4: Simplify right side
    753.02x = 483,668.82
  5. Step 5: Solve for x
    x = 483,668.82/753.02
  6. Step 6: Final answer
    x = 642.31

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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.