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Finding the Fourth Proportional to 315.40, 473.10 and 98.95

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Solution

The fourth proportional to 315.40, 473.10 and 98.95 is: 148.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.40 : 473.10 = 98.95 : x
  2. Step 2: Convert to fraction form
    315.40/473.10 = 98.95/x
  3. Step 3: Cross multiply
    315.40x = 473.10 × 98.95
  4. Step 4: Simplify right side
    315.40x = 46,813.25
  5. Step 5: Solve for x
    x = 46,813.25/315.40
  6. Step 6: Final answer
    x = 148.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.