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Finding the Fourth Proportional to 500.32, 690.42 and 279.28

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Solution

The fourth proportional to 500.32, 690.42 and 279.28 is: 385.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.32 : 690.42 = 279.28 : x
  2. Step 2: Convert to fraction form
    500.32/690.42 = 279.28/x
  3. Step 3: Cross multiply
    500.32x = 690.42 × 279.28
  4. Step 4: Simplify right side
    500.32x = 192,820.50
  5. Step 5: Solve for x
    x = 192,820.50/500.32
  6. Step 6: Final answer
    x = 385.39

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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.