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Finding the Fourth Proportional to 646.65, 970.47 and 235.90

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Solution

The fourth proportional to 646.65, 970.47 and 235.90 is: 354.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.65 : 970.47 = 235.90 : x
  2. Step 2: Convert to fraction form
    646.65/970.47 = 235.90/x
  3. Step 3: Cross multiply
    646.65x = 970.47 × 235.90
  4. Step 4: Simplify right side
    646.65x = 228,933.87
  5. Step 5: Solve for x
    x = 228,933.87/646.65
  6. Step 6: Final answer
    x = 354.03

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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.