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Finding the Fourth Proportional to 647.60, 970.74 and 415.82

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Solution

The fourth proportional to 647.60, 970.74 and 415.82 is: 623.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.60 : 970.74 = 415.82 : x
  2. Step 2: Convert to fraction form
    647.60/970.74 = 415.82/x
  3. Step 3: Cross multiply
    647.60x = 970.74 × 415.82
  4. Step 4: Simplify right side
    647.60x = 403,653.11
  5. Step 5: Solve for x
    x = 403,653.11/647.60
  6. Step 6: Final answer
    x = 623.31

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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.