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Finding the Fourth Proportional to 14,485.68, 21,718.80 and 7,905.60

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Solution

The fourth proportional to 14,485.68, 21,718.80 and 7,905.60 is: 11,853.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,485.68 : 21,718.80 = 7,905.60 : x
  2. Step 2: Convert to fraction form
    14,485.68/21,718.80 = 7,905.60/x
  3. Step 3: Cross multiply
    14,485.68x = 21,718.80 × 7,905.60
  4. Step 4: Simplify right side
    14,485.68x = 171,700,145.28
  5. Step 5: Solve for x
    x = 171,700,145.28/14,485.68
  6. Step 6: Final answer
    x = 11,853.10

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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.