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Finding the Fourth Proportional to 651.98, 893.70 and 643.22

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Solution

The fourth proportional to 651.98, 893.70 and 643.22 is: 881.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.98 : 893.70 = 643.22 : x
  2. Step 2: Convert to fraction form
    651.98/893.70 = 643.22/x
  3. Step 3: Cross multiply
    651.98x = 893.70 × 643.22
  4. Step 4: Simplify right side
    651.98x = 574,845.71
  5. Step 5: Solve for x
    x = 574,845.71/651.98
  6. Step 6: Final answer
    x = 881.69

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.