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Finding the Fourth Proportional to 285.84, 428.76 and 123.60

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Solution

The fourth proportional to 285.84, 428.76 and 123.60 is: 185.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.84 : 428.76 = 123.60 : x
  2. Step 2: Convert to fraction form
    285.84/428.76 = 123.60/x
  3. Step 3: Cross multiply
    285.84x = 428.76 × 123.60
  4. Step 4: Simplify right side
    285.84x = 52,994.74
  5. Step 5: Solve for x
    x = 52,994.74/285.84
  6. Step 6: Final answer
    x = 185.40

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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.