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Finding the Fourth Proportional to 309.45, 425.73 and 302.16

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Solution

The fourth proportional to 309.45, 425.73 and 302.16 is: 415.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.45 : 425.73 = 302.16 : x
  2. Step 2: Convert to fraction form
    309.45/425.73 = 302.16/x
  3. Step 3: Cross multiply
    309.45x = 425.73 × 302.16
  4. Step 4: Simplify right side
    309.45x = 128,638.58
  5. Step 5: Solve for x
    x = 128,638.58/309.45
  6. Step 6: Final answer
    x = 415.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.