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Finding the Fourth Proportional to 312.16, 430.70 and 207.40

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Solution

The fourth proportional to 312.16, 430.70 and 207.40 is: 286.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.16 : 430.70 = 207.40 : x
  2. Step 2: Convert to fraction form
    312.16/430.70 = 207.40/x
  3. Step 3: Cross multiply
    312.16x = 430.70 × 207.40
  4. Step 4: Simplify right side
    312.16x = 89,327.18
  5. Step 5: Solve for x
    x = 89,327.18/312.16
  6. Step 6: Final answer
    x = 286.16

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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.