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Finding the Fourth Proportional to 917.14, 1,376.31 and 856.40

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Solution

The fourth proportional to 917.14, 1,376.31 and 856.40 is: 1,285.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.14 : 1,376.31 = 856.40 : x
  2. Step 2: Convert to fraction form
    917.14/1,376.31 = 856.40/x
  3. Step 3: Cross multiply
    917.14x = 1,376.31 × 856.40
  4. Step 4: Simplify right side
    917.14x = 1,178,671.88
  5. Step 5: Solve for x
    x = 1,178,671.88/917.14
  6. Step 6: Final answer
    x = 1,285.16

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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.