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Finding the Fourth Proportional to 500.54, 690.77 and 279.53

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Solution

The fourth proportional to 500.54, 690.77 and 279.53 is: 385.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.54 : 690.77 = 279.53 : x
  2. Step 2: Convert to fraction form
    500.54/690.77 = 279.53/x
  3. Step 3: Cross multiply
    500.54x = 690.77 × 279.53
  4. Step 4: Simplify right side
    500.54x = 193,090.94
  5. Step 5: Solve for x
    x = 193,090.94/500.54
  6. Step 6: Final answer
    x = 385.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.