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Finding the Fourth Proportional to 401.90, 555.05 and 315.23

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Solution

The fourth proportional to 401.90, 555.05 and 315.23 is: 435.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.90 : 555.05 = 315.23 : x
  2. Step 2: Convert to fraction form
    401.90/555.05 = 315.23/x
  3. Step 3: Cross multiply
    401.90x = 555.05 × 315.23
  4. Step 4: Simplify right side
    401.90x = 174,966.42
  5. Step 5: Solve for x
    x = 174,966.42/401.90
  6. Step 6: Final answer
    x = 435.35

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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.