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Finding the Fourth Proportional to 309.30, 424.74 and 260.10

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Solution

The fourth proportional to 309.30, 424.74 and 260.10 is: 357.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.30 : 424.74 = 260.10 : x
  2. Step 2: Convert to fraction form
    309.30/424.74 = 260.10/x
  3. Step 3: Cross multiply
    309.30x = 424.74 × 260.10
  4. Step 4: Simplify right side
    309.30x = 110,474.87
  5. Step 5: Solve for x
    x = 110,474.87/309.30
  6. Step 6: Final answer
    x = 357.18

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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.