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Finding the Fourth Proportional to 8,915.80, 13,368.84 and 7,078.72

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Solution

The fourth proportional to 8,915.80, 13,368.84 and 7,078.72 is: 10,614.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,915.80 : 13,368.84 = 7,078.72 : x
  2. Step 2: Convert to fraction form
    8,915.80/13,368.84 = 7,078.72/x
  3. Step 3: Cross multiply
    8,915.80x = 13,368.84 × 7,078.72
  4. Step 4: Simplify right side
    8,915.80x = 94,634,275.08
  5. Step 5: Solve for x
    x = 94,634,275.08/8,915.80
  6. Step 6: Final answer
    x = 10,614.22

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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.