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Finding the Fourth Proportional to 287.64, 430.98 and 255.06

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Solution

The fourth proportional to 287.64, 430.98 and 255.06 is: 382.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.64 : 430.98 = 255.06 : x
  2. Step 2: Convert to fraction form
    287.64/430.98 = 255.06/x
  3. Step 3: Cross multiply
    287.64x = 430.98 × 255.06
  4. Step 4: Simplify right side
    287.64x = 109,925.76
  5. Step 5: Solve for x
    x = 109,925.76/287.64
  6. Step 6: Final answer
    x = 382.16

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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.