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Finding the Fourth Proportional to 313.16, 432.18 and 208.40

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Solution

The fourth proportional to 313.16, 432.18 and 208.40 is: 287.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.16 : 432.18 = 208.40 : x
  2. Step 2: Convert to fraction form
    313.16/432.18 = 208.40/x
  3. Step 3: Cross multiply
    313.16x = 432.18 × 208.40
  4. Step 4: Simplify right side
    313.16x = 90,064.15
  5. Step 5: Solve for x
    x = 90,064.15/313.16
  6. Step 6: Final answer
    x = 287.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.