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Finding the Fourth Proportional to 752.63, 1,038.93 and 490.79

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Solution

The fourth proportional to 752.63, 1,038.93 and 490.79 is: 677.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.63 : 1,038.93 = 490.79 : x
  2. Step 2: Convert to fraction form
    752.63/1,038.93 = 490.79/x
  3. Step 3: Cross multiply
    752.63x = 1,038.93 × 490.79
  4. Step 4: Simplify right side
    752.63x = 509,897.21
  5. Step 5: Solve for x
    x = 509,897.21/752.63
  6. Step 6: Final answer
    x = 677.49

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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.