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Finding the Fourth Proportional to 854.10, 1,178.01 and 644.34

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Solution

The fourth proportional to 854.10, 1,178.01 and 644.34 is: 888.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.10 : 1,178.01 = 644.34 : x
  2. Step 2: Convert to fraction form
    854.10/1,178.01 = 644.34/x
  3. Step 3: Cross multiply
    854.10x = 1,178.01 × 644.34
  4. Step 4: Simplify right side
    854.10x = 759,038.96
  5. Step 5: Solve for x
    x = 759,038.96/854.10
  6. Step 6: Final answer
    x = 888.70

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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.