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Finding the Fourth Proportional to 860.99, 1,291.46 and 495.53

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Solution

The fourth proportional to 860.99, 1,291.46 and 495.53 is: 743.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.99 : 1,291.46 = 495.53 : x
  2. Step 2: Convert to fraction form
    860.99/1,291.46 = 495.53/x
  3. Step 3: Cross multiply
    860.99x = 1,291.46 × 495.53
  4. Step 4: Simplify right side
    860.99x = 639,948.24
  5. Step 5: Solve for x
    x = 639,948.24/860.99
  6. Step 6: Final answer
    x = 743.27

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Double scale
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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.