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Finding the Fourth Proportional to 315.99, 474.08 and 99.59

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Solution

The fourth proportional to 315.99, 474.08 and 99.59 is: 149.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.99 : 474.08 = 99.59 : x
  2. Step 2: Convert to fraction form
    315.99/474.08 = 99.59/x
  3. Step 3: Cross multiply
    315.99x = 474.08 × 99.59
  4. Step 4: Simplify right side
    315.99x = 47,210.76
  5. Step 5: Solve for x
    x = 47,210.76/315.99
  6. Step 6: Final answer
    x = 149.41

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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.