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Finding the Fourth Proportional to 3,125.75, 4,688.53 and 785.75

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Solution

The fourth proportional to 3,125.75, 4,688.53 and 785.75 is: 1,178.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,125.75 : 4,688.53 = 785.75 : x
  2. Step 2: Convert to fraction form
    3,125.75/4,688.53 = 785.75/x
  3. Step 3: Cross multiply
    3,125.75x = 4,688.53 × 785.75
  4. Step 4: Simplify right side
    3,125.75x = 3,683,987.04
  5. Step 5: Solve for x
    x = 3,683,987.04/3,125.75
  6. Step 6: Final answer
    x = 1,178.59

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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.