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Finding the Fourth Proportional to 9,840.80, 14,728.80 and 7,637.60

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Solution

The fourth proportional to 9,840.80, 14,728.80 and 7,637.60 is: 11,431.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,840.80 : 14,728.80 = 7,637.60 : x
  2. Step 2: Convert to fraction form
    9,840.80/14,728.80 = 7,637.60/x
  3. Step 3: Cross multiply
    9,840.80x = 14,728.80 × 7,637.60
  4. Step 4: Simplify right side
    9,840.80x = 112,492,682.88
  5. Step 5: Solve for x
    x = 112,492,682.88/9,840.80
  6. Step 6: Final answer
    x = 11,431.25

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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.