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Finding the Fourth Proportional to 405.80, 607.52 and 259.72

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Solution

The fourth proportional to 405.80, 607.52 and 259.72 is: 388.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.80 : 607.52 = 259.72 : x
  2. Step 2: Convert to fraction form
    405.80/607.52 = 259.72/x
  3. Step 3: Cross multiply
    405.80x = 607.52 × 259.72
  4. Step 4: Simplify right side
    405.80x = 157,784.22
  5. Step 5: Solve for x
    x = 157,784.22/405.80
  6. Step 6: Final answer
    x = 388.82

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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.