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Finding the Fourth Proportional to 7,490.40, 11,259.90 and 6,421.20

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Solution

The fourth proportional to 7,490.40, 11,259.90 and 6,421.20 is: 9,652.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,490.40 : 11,259.90 = 6,421.20 : x
  2. Step 2: Convert to fraction form
    7,490.40/11,259.90 = 6,421.20/x
  3. Step 3: Cross multiply
    7,490.40x = 11,259.90 × 6,421.20
  4. Step 4: Simplify right side
    7,490.40x = 72,302,069.88
  5. Step 5: Solve for x
    x = 72,302,069.88/7,490.40
  6. Step 6: Final answer
    x = 9,652.63

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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.