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Finding the Fourth Proportional to 870.74, 1,306.12 and 285.78

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Solution

The fourth proportional to 870.74, 1,306.12 and 285.78 is: 428.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.74 : 1,306.12 = 285.78 : x
  2. Step 2: Convert to fraction form
    870.74/1,306.12 = 285.78/x
  3. Step 3: Cross multiply
    870.74x = 1,306.12 × 285.78
  4. Step 4: Simplify right side
    870.74x = 373,262.97
  5. Step 5: Solve for x
    x = 373,262.97/870.74
  6. Step 6: Final answer
    x = 428.67

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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.