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Finding the Fourth Proportional to 1,230.42, 1,697.15 and 856.91

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Solution

The fourth proportional to 1,230.42, 1,697.15 and 856.91 is: 1,181.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.42 : 1,697.15 = 856.91 : x
  2. Step 2: Convert to fraction form
    1,230.42/1,697.15 = 856.91/x
  3. Step 3: Cross multiply
    1,230.42x = 1,697.15 × 856.91
  4. Step 4: Simplify right side
    1,230.42x = 1,454,311.19
  5. Step 5: Solve for x
    x = 1,454,311.19/1,230.42
  6. Step 6: Final answer
    x = 1,181.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.