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Finding the Fourth Proportional to 500.15, 690.12 and 279.08

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Solution

The fourth proportional to 500.15, 690.12 and 279.08 is: 385.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.15 : 690.12 = 279.08 : x
  2. Step 2: Convert to fraction form
    500.15/690.12 = 279.08/x
  3. Step 3: Cross multiply
    500.15x = 690.12 × 279.08
  4. Step 4: Simplify right side
    500.15x = 192,598.69
  5. Step 5: Solve for x
    x = 192,598.69/500.15
  6. Step 6: Final answer
    x = 385.08

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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.