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Finding the Fourth Proportional to 860.37, 1,291.40 and 398.25

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Solution

The fourth proportional to 860.37, 1,291.40 and 398.25 is: 597.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.37 : 1,291.40 = 398.25 : x
  2. Step 2: Convert to fraction form
    860.37/1,291.40 = 398.25/x
  3. Step 3: Cross multiply
    860.37x = 1,291.40 × 398.25
  4. Step 4: Simplify right side
    860.37x = 514,301.05
  5. Step 5: Solve for x
    x = 514,301.05/860.37
  6. Step 6: Final answer
    x = 597.77

Related Problems

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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.