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Finding the Fourth Proportional to 613.40, 920.80 and 339.74

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Solution

The fourth proportional to 613.40, 920.80 and 339.74 is: 510.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.40 : 920.80 = 339.74 : x
  2. Step 2: Convert to fraction form
    613.40/920.80 = 339.74/x
  3. Step 3: Cross multiply
    613.40x = 920.80 × 339.74
  4. Step 4: Simplify right side
    613.40x = 312,832.59
  5. Step 5: Solve for x
    x = 312,832.59/613.40
  6. Step 6: Final answer
    x = 510.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.