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Finding the Fourth Proportional to 315.40, 473.20 and 98.98

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Solution

The fourth proportional to 315.40, 473.20 and 98.98 is: 148.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.40 : 473.20 = 98.98 : x
  2. Step 2: Convert to fraction form
    315.40/473.20 = 98.98/x
  3. Step 3: Cross multiply
    315.40x = 473.20 × 98.98
  4. Step 4: Simplify right side
    315.40x = 46,837.34
  5. Step 5: Solve for x
    x = 46,837.34/315.40
  6. Step 6: Final answer
    x = 148.50

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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.