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Finding the Fourth Proportional to 646.90, 969.81 and 553.99

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Solution

The fourth proportional to 646.90, 969.81 and 553.99 is: 830.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.90 : 969.81 = 553.99 : x
  2. Step 2: Convert to fraction form
    646.90/969.81 = 553.99/x
  3. Step 3: Cross multiply
    646.90x = 969.81 × 553.99
  4. Step 4: Simplify right side
    646.90x = 537,268.64
  5. Step 5: Solve for x
    x = 537,268.64/646.90
  6. Step 6: Final answer
    x = 830.53

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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.