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Finding the Fourth Proportional to 7,187.81, 9,918.75 and 4,000.86

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Solution

The fourth proportional to 7,187.81, 9,918.75 and 4,000.86 is: 5,520.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,187.81 : 9,918.75 = 4,000.86 : x
  2. Step 2: Convert to fraction form
    7,187.81/9,918.75 = 4,000.86/x
  3. Step 3: Cross multiply
    7,187.81x = 9,918.75 × 4,000.86
  4. Step 4: Simplify right side
    7,187.81x = 39,683,545.13
  5. Step 5: Solve for x
    x = 39,683,545.13/7,187.81
  6. Step 6: Final answer
    x = 5,520.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.