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Finding the Fourth Proportional to 402.65, 555.97 and 309.25

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Solution

The fourth proportional to 402.65, 555.97 and 309.25 is: 427.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.65 : 555.97 = 309.25 : x
  2. Step 2: Convert to fraction form
    402.65/555.97 = 309.25/x
  3. Step 3: Cross multiply
    402.65x = 555.97 × 309.25
  4. Step 4: Simplify right side
    402.65x = 171,931.10
  5. Step 5: Solve for x
    x = 171,931.10/402.65
  6. Step 6: Final answer
    x = 427.00

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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.