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Finding the Fourth Proportional to 287.10, 427.98 and 283.86

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Solution

The fourth proportional to 287.10, 427.98 and 283.86 is: 423.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.10 : 427.98 = 283.86 : x
  2. Step 2: Convert to fraction form
    287.10/427.98 = 283.86/x
  3. Step 3: Cross multiply
    287.10x = 427.98 × 283.86
  4. Step 4: Simplify right side
    287.10x = 121,486.40
  5. Step 5: Solve for x
    x = 121,486.40/287.10
  6. Step 6: Final answer
    x = 423.15

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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.