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Finding the Fourth Proportional to 315.40, 469.88 and 299.60

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Solution

The fourth proportional to 315.40, 469.88 and 299.60 is: 446.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.40 : 469.88 = 299.60 : x
  2. Step 2: Convert to fraction form
    315.40/469.88 = 299.60/x
  3. Step 3: Cross multiply
    315.40x = 469.88 × 299.60
  4. Step 4: Simplify right side
    315.40x = 140,776.05
  5. Step 5: Solve for x
    x = 140,776.05/315.40
  6. Step 6: Final answer
    x = 446.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.