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Finding the Fourth Proportional to 647.80, 970.62 and 455.08

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Solution

The fourth proportional to 647.80, 970.62 and 455.08 is: 681.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.80 : 970.62 = 455.08 : x
  2. Step 2: Convert to fraction form
    647.80/970.62 = 455.08/x
  3. Step 3: Cross multiply
    647.80x = 970.62 × 455.08
  4. Step 4: Simplify right side
    647.80x = 441,709.75
  5. Step 5: Solve for x
    x = 441,709.75/647.80
  6. Step 6: Final answer
    x = 681.86

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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.