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Finding the Fourth Proportional to 860.51, 1,290.86 and 495.30

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Solution

The fourth proportional to 860.51, 1,290.86 and 495.30 is: 743.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.51 : 1,290.86 = 495.30 : x
  2. Step 2: Convert to fraction form
    860.51/1,290.86 = 495.30/x
  3. Step 3: Cross multiply
    860.51x = 1,290.86 × 495.30
  4. Step 4: Simplify right side
    860.51x = 639,356.50
  5. Step 5: Solve for x
    x = 639,356.50/860.51
  6. Step 6: Final answer
    x = 743.00

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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.