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Finding the Fourth Proportional to 3,913.90, 5,870.88 and 992.20

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Solution

The fourth proportional to 3,913.90, 5,870.88 and 992.20 is: 1,488.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,913.90 : 5,870.88 = 992.20 : x
  2. Step 2: Convert to fraction form
    3,913.90/5,870.88 = 992.20/x
  3. Step 3: Cross multiply
    3,913.90x = 5,870.88 × 992.20
  4. Step 4: Simplify right side
    3,913.90x = 5,825,087.14
  5. Step 5: Solve for x
    x = 5,825,087.14/3,913.90
  6. Step 6: Final answer
    x = 1,488.31

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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.