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Finding the Fourth Proportional to 753.56, 1,129.98 and 428.36

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Solution

The fourth proportional to 753.56, 1,129.98 and 428.36 is: 642.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.56 : 1,129.98 = 428.36 : x
  2. Step 2: Convert to fraction form
    753.56/1,129.98 = 428.36/x
  3. Step 3: Cross multiply
    753.56x = 1,129.98 × 428.36
  4. Step 4: Simplify right side
    753.56x = 484,038.23
  5. Step 5: Solve for x
    x = 484,038.23/753.56
  6. Step 6: Final answer
    x = 642.34

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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.