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Finding the Fourth Proportional to 856.94, 1,285.40 and 207.67

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Solution

The fourth proportional to 856.94, 1,285.40 and 207.67 is: 311.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.94 : 1,285.40 = 207.67 : x
  2. Step 2: Convert to fraction form
    856.94/1,285.40 = 207.67/x
  3. Step 3: Cross multiply
    856.94x = 1,285.40 × 207.67
  4. Step 4: Simplify right side
    856.94x = 266,931.55
  5. Step 5: Solve for x
    x = 266,931.55/856.94
  6. Step 6: Final answer
    x = 311.50

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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.