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Finding the Fourth Proportional to 913.63, 1,260.26 and 692.20

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Solution

The fourth proportional to 913.63, 1,260.26 and 692.20 is: 954.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.63 : 1,260.26 = 692.20 : x
  2. Step 2: Convert to fraction form
    913.63/1,260.26 = 692.20/x
  3. Step 3: Cross multiply
    913.63x = 1,260.26 × 692.20
  4. Step 4: Simplify right side
    913.63x = 872,345.59
  5. Step 5: Solve for x
    x = 872,345.59/913.63
  6. Step 6: Final answer
    x = 954.81

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1.5x scale

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.