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Finding the Fourth Proportional to 647.78, 972 and 374.12

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Solution

The fourth proportional to 647.78, 972 and 374.12 is: 561.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.78 : 972 = 374.12 : x
  2. Step 2: Convert to fraction form
    647.78/972 = 374.12/x
  3. Step 3: Cross multiply
    647.78x = 972 × 374.12
  4. Step 4: Simplify right side
    647.78x = 363,644.64
  5. Step 5: Solve for x
    x = 363,644.64/647.78
  6. Step 6: Final answer
    x = 561.37

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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.