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Finding the Fourth Proportional to 771.81, 1,156.01 and 386.25

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Solution

The fourth proportional to 771.81, 1,156.01 and 386.25 is: 578.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.81 : 1,156.01 = 386.25 : x
  2. Step 2: Convert to fraction form
    771.81/1,156.01 = 386.25/x
  3. Step 3: Cross multiply
    771.81x = 1,156.01 × 386.25
  4. Step 4: Simplify right side
    771.81x = 446,506.93
  5. Step 5: Solve for x
    x = 446,506.93/771.81
  6. Step 6: Final answer
    x = 578.52

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Double scale
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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.