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Finding the Fourth Proportional to 647.56, 970.38 and 455.56

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Solution

The fourth proportional to 647.56, 970.38 and 455.56 is: 682.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.56 : 970.38 = 455.56 : x
  2. Step 2: Convert to fraction form
    647.56/970.38 = 455.56/x
  3. Step 3: Cross multiply
    647.56x = 970.38 × 455.56
  4. Step 4: Simplify right side
    647.56x = 442,066.31
  5. Step 5: Solve for x
    x = 442,066.31/647.56
  6. Step 6: Final answer
    x = 682.66

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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.