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Finding the Fourth Proportional to 9,915.26, 14,880.08 and 7,990.70

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Solution

The fourth proportional to 9,915.26, 14,880.08 and 7,990.70 is: 11,991.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,915.26 : 14,880.08 = 7,990.70 : x
  2. Step 2: Convert to fraction form
    9,915.26/14,880.08 = 7,990.70/x
  3. Step 3: Cross multiply
    9,915.26x = 14,880.08 × 7,990.70
  4. Step 4: Simplify right side
    9,915.26x = 118,902,200.83
  5. Step 5: Solve for x
    x = 118,902,200.83/9,915.26
  6. Step 6: Final answer
    x = 11,991.84

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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.