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Finding the Fourth Proportional to 4,986.90, 7,480.35 and 4,218.90

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Solution

The fourth proportional to 4,986.90, 7,480.35 and 4,218.90 is: 6,328.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,986.90 : 7,480.35 = 4,218.90 : x
  2. Step 2: Convert to fraction form
    4,986.90/7,480.35 = 4,218.90/x
  3. Step 3: Cross multiply
    4,986.90x = 7,480.35 × 4,218.90
  4. Step 4: Simplify right side
    4,986.90x = 31,558,848.62
  5. Step 5: Solve for x
    x = 31,558,848.62/4,986.90
  6. Step 6: Final answer
    x = 6,328.35

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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.