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Finding the Fourth Proportional to 535.55, 803.32 and 428.02

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Solution

The fourth proportional to 535.55, 803.32 and 428.02 is: 642.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.55 : 803.32 = 428.02 : x
  2. Step 2: Convert to fraction form
    535.55/803.32 = 428.02/x
  3. Step 3: Cross multiply
    535.55x = 803.32 × 428.02
  4. Step 4: Simplify right side
    535.55x = 343,838.10
  5. Step 5: Solve for x
    x = 343,838.10/535.55
  6. Step 6: Final answer
    x = 642.03

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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.