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Finding the Fourth Proportional to 371.90, 555.40 and 317.36

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Solution

The fourth proportional to 371.90, 555.40 and 317.36 is: 473.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.90 : 555.40 = 317.36 : x
  2. Step 2: Convert to fraction form
    371.90/555.40 = 317.36/x
  3. Step 3: Cross multiply
    371.90x = 555.40 × 317.36
  4. Step 4: Simplify right side
    371.90x = 176,261.74
  5. Step 5: Solve for x
    x = 176,261.74/371.90
  6. Step 6: Final answer
    x = 473.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.