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Finding the Fourth Proportional to 368.89, 555.65 and 312.39

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Solution

The fourth proportional to 368.89, 555.65 and 312.39 is: 470.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.89 : 555.65 = 312.39 : x
  2. Step 2: Convert to fraction form
    368.89/555.65 = 312.39/x
  3. Step 3: Cross multiply
    368.89x = 555.65 × 312.39
  4. Step 4: Simplify right side
    368.89x = 173,579.50
  5. Step 5: Solve for x
    x = 173,579.50/368.89
  6. Step 6: Final answer
    x = 470.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.