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Finding the Fourth Proportional to 405.57, 605.56 and 347.70

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Solution

The fourth proportional to 405.57, 605.56 and 347.70 is: 519.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.57 : 605.56 = 347.70 : x
  2. Step 2: Convert to fraction form
    405.57/605.56 = 347.70/x
  3. Step 3: Cross multiply
    405.57x = 605.56 × 347.70
  4. Step 4: Simplify right side
    405.57x = 210,552.34
  5. Step 5: Solve for x
    x = 210,552.34/405.57
  6. Step 6: Final answer
    x = 519.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.