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Finding the Fourth Proportional to 761.94, 1,147.50 and 647.19

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Solution

The fourth proportional to 761.94, 1,147.50 and 647.19 is: 974.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.94 : 1,147.50 = 647.19 : x
  2. Step 2: Convert to fraction form
    761.94/1,147.50 = 647.19/x
  3. Step 3: Cross multiply
    761.94x = 1,147.50 × 647.19
  4. Step 4: Simplify right side
    761.94x = 742,650.53
  5. Step 5: Solve for x
    x = 742,650.53/761.94
  6. Step 6: Final answer
    x = 974.68

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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.