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Finding the Fourth Proportional to 10,689.60, 16,012.80 and 7,406.40

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Solution

The fourth proportional to 10,689.60, 16,012.80 and 7,406.40 is: 11,094.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,689.60 : 16,012.80 = 7,406.40 : x
  2. Step 2: Convert to fraction form
    10,689.60/16,012.80 = 7,406.40/x
  3. Step 3: Cross multiply
    10,689.60x = 16,012.80 × 7,406.40
  4. Step 4: Simplify right side
    10,689.60x = 118,597,201.92
  5. Step 5: Solve for x
    x = 118,597,201.92/10,689.60
  6. Step 6: Final answer
    x = 11,094.63

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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.