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Finding the Fourth Proportional to 782.81, 1,174.40 and 417.51

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Solution

The fourth proportional to 782.81, 1,174.40 and 417.51 is: 626.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.81 : 1,174.40 = 417.51 : x
  2. Step 2: Convert to fraction form
    782.81/1,174.40 = 417.51/x
  3. Step 3: Cross multiply
    782.81x = 1,174.40 × 417.51
  4. Step 4: Simplify right side
    782.81x = 490,321.66
  5. Step 5: Solve for x
    x = 490,321.66/782.81
  6. Step 6: Final answer
    x = 626.37

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1.5x scale

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.