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Finding the Fourth Proportional to 646.81, 970.36 and 338.60

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Solution

The fourth proportional to 646.81, 970.36 and 338.60 is: 507.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.81 : 970.36 = 338.60 : x
  2. Step 2: Convert to fraction form
    646.81/970.36 = 338.60/x
  3. Step 3: Cross multiply
    646.81x = 970.36 × 338.60
  4. Step 4: Simplify right side
    646.81x = 328,565.48
  5. Step 5: Solve for x
    x = 328,565.48/646.81
  6. Step 6: Final answer
    x = 507.98

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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.