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Finding the Fourth Proportional to 646.93, 970.53 and 208.20

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Solution

The fourth proportional to 646.93, 970.53 and 208.20 is: 312.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.93 : 970.53 = 208.20 : x
  2. Step 2: Convert to fraction form
    646.93/970.53 = 208.20/x
  3. Step 3: Cross multiply
    646.93x = 970.53 × 208.20
  4. Step 4: Simplify right side
    646.93x = 202,064.35
  5. Step 5: Solve for x
    x = 202,064.35/646.93
  6. Step 6: Final answer
    x = 312.34

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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.