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Finding the Fourth Proportional to 315.64, 473.43 and 99.21

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Solution

The fourth proportional to 315.64, 473.43 and 99.21 is: 148.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.64 : 473.43 = 99.21 : x
  2. Step 2: Convert to fraction form
    315.64/473.43 = 99.21/x
  3. Step 3: Cross multiply
    315.64x = 473.43 × 99.21
  4. Step 4: Simplify right side
    315.64x = 46,968.99
  5. Step 5: Solve for x
    x = 46,968.99/315.64
  6. Step 6: Final answer
    x = 148.81

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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.