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Finding the Fourth Proportional to 9,364.78, 12,928.76 and 6,987.80

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Solution

The fourth proportional to 9,364.78, 12,928.76 and 6,987.80 is: 9,647.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,364.78 : 12,928.76 = 6,987.80 : x
  2. Step 2: Convert to fraction form
    9,364.78/12,928.76 = 6,987.80/x
  3. Step 3: Cross multiply
    9,364.78x = 12,928.76 × 6,987.80
  4. Step 4: Simplify right side
    9,364.78x = 90,343,589.13
  5. Step 5: Solve for x
    x = 90,343,589.13/9,364.78
  6. Step 6: Final answer
    x = 9,647.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.