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Finding the Fourth Proportional to 619.98, 855.53 and 340.21

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Solution

The fourth proportional to 619.98, 855.53 and 340.21 is: 469.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.98 : 855.53 = 340.21 : x
  2. Step 2: Convert to fraction form
    619.98/855.53 = 340.21/x
  3. Step 3: Cross multiply
    619.98x = 855.53 × 340.21
  4. Step 4: Simplify right side
    619.98x = 291,059.86
  5. Step 5: Solve for x
    x = 291,059.86/619.98
  6. Step 6: Final answer
    x = 469.47

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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.