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Finding the Fourth Proportional to 761.58, 1,146.80 and 646.43

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Solution

The fourth proportional to 761.58, 1,146.80 and 646.43 is: 973.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.58 : 1,146.80 = 646.43 : x
  2. Step 2: Convert to fraction form
    761.58/1,146.80 = 646.43/x
  3. Step 3: Cross multiply
    761.58x = 1,146.80 × 646.43
  4. Step 4: Simplify right side
    761.58x = 741,316.96
  5. Step 5: Solve for x
    x = 741,316.96/761.58
  6. Step 6: Final answer
    x = 973.39

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.