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Finding the Fourth Proportional to 646.81, 893.30 and 558.72

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Solution

The fourth proportional to 646.81, 893.30 and 558.72 is: 771.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.81 : 893.30 = 558.72 : x
  2. Step 2: Convert to fraction form
    646.81/893.30 = 558.72/x
  3. Step 3: Cross multiply
    646.81x = 893.30 × 558.72
  4. Step 4: Simplify right side
    646.81x = 499,101.78
  5. Step 5: Solve for x
    x = 499,101.78/646.81
  6. Step 6: Final answer
    x = 771.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.