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Finding the Fourth Proportional to 678.56, 1,018.44 and 434.32

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Solution

The fourth proportional to 678.56, 1,018.44 and 434.32 is: 651.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.56 : 1,018.44 = 434.32 : x
  2. Step 2: Convert to fraction form
    678.56/1,018.44 = 434.32/x
  3. Step 3: Cross multiply
    678.56x = 1,018.44 × 434.32
  4. Step 4: Simplify right side
    678.56x = 442,328.86
  5. Step 5: Solve for x
    x = 442,328.86/678.56
  6. Step 6: Final answer
    x = 651.86

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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.