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Finding the Fourth Proportional to 405.51, 554.78 and 403.77

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Solution

The fourth proportional to 405.51, 554.78 and 403.77 is: 552.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.51 : 554.78 = 403.77 : x
  2. Step 2: Convert to fraction form
    405.51/554.78 = 403.77/x
  3. Step 3: Cross multiply
    405.51x = 554.78 × 403.77
  4. Step 4: Simplify right side
    405.51x = 224,003.52
  5. Step 5: Solve for x
    x = 224,003.52/405.51
  6. Step 6: Final answer
    x = 552.40

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.