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Finding the Fourth Proportional to 405.56, 562.55 and 390.98

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Solution

The fourth proportional to 405.56, 562.55 and 390.98 is: 542.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.56 : 562.55 = 390.98 : x
  2. Step 2: Convert to fraction form
    405.56/562.55 = 390.98/x
  3. Step 3: Cross multiply
    405.56x = 562.55 × 390.98
  4. Step 4: Simplify right side
    405.56x = 219,945.80
  5. Step 5: Solve for x
    x = 219,945.80/405.56
  6. Step 6: Final answer
    x = 542.33

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.