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Finding the Fourth Proportional to 860.05, 1,289.53 and 397.19

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Solution

The fourth proportional to 860.05, 1,289.53 and 397.19 is: 595.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.05 : 1,289.53 = 397.19 : x
  2. Step 2: Convert to fraction form
    860.05/1,289.53 = 397.19/x
  3. Step 3: Cross multiply
    860.05x = 1,289.53 × 397.19
  4. Step 4: Simplify right side
    860.05x = 512,188.42
  5. Step 5: Solve for x
    x = 512,188.42/860.05
  6. Step 6: Final answer
    x = 595.53

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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.