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Finding the Fourth Proportional to 500.24, 690.60 and 345.20

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Solution

The fourth proportional to 500.24, 690.60 and 345.20 is: 476.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.24 : 690.60 = 345.20 : x
  2. Step 2: Convert to fraction form
    500.24/690.60 = 345.20/x
  3. Step 3: Cross multiply
    500.24x = 690.60 × 345.20
  4. Step 4: Simplify right side
    500.24x = 238,395.12
  5. Step 5: Solve for x
    x = 238,395.12/500.24
  6. Step 6: Final answer
    x = 476.56

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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.