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Finding the Fourth Proportional to 312.32, 430.74 and 228.40

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Solution

The fourth proportional to 312.32, 430.74 and 228.40 is: 315.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.32 : 430.74 = 228.40 : x
  2. Step 2: Convert to fraction form
    312.32/430.74 = 228.40/x
  3. Step 3: Cross multiply
    312.32x = 430.74 × 228.40
  4. Step 4: Simplify right side
    312.32x = 98,381.02
  5. Step 5: Solve for x
    x = 98,381.02/312.32
  6. Step 6: Final answer
    x = 315.00

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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.