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Finding the Fourth Proportional to 531.72, 797.76 and 455.40

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Solution

The fourth proportional to 531.72, 797.76 and 455.40 is: 683.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.72 : 797.76 = 455.40 : x
  2. Step 2: Convert to fraction form
    531.72/797.76 = 455.40/x
  3. Step 3: Cross multiply
    531.72x = 797.76 × 455.40
  4. Step 4: Simplify right side
    531.72x = 363,299.90
  5. Step 5: Solve for x
    x = 363,299.90/531.72
  6. Step 6: Final answer
    x = 683.25

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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.