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Finding the Fourth Proportional to 860.52, 1,290.06 and 427.08

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Solution

The fourth proportional to 860.52, 1,290.06 and 427.08 is: 640.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.52 : 1,290.06 = 427.08 : x
  2. Step 2: Convert to fraction form
    860.52/1,290.06 = 427.08/x
  3. Step 3: Cross multiply
    860.52x = 1,290.06 × 427.08
  4. Step 4: Simplify right side
    860.52x = 550,958.82
  5. Step 5: Solve for x
    x = 550,958.82/860.52
  6. Step 6: Final answer
    x = 640.26

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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.