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Finding the Fourth Proportional to 13,707.50, 18,915.93 and 7,738.81

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Solution

The fourth proportional to 13,707.50, 18,915.93 and 7,738.81 is: 10,679.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,707.50 : 18,915.93 = 7,738.81 : x
  2. Step 2: Convert to fraction form
    13,707.50/18,915.93 = 7,738.81/x
  3. Step 3: Cross multiply
    13,707.50x = 18,915.93 × 7,738.81
  4. Step 4: Simplify right side
    13,707.50x = 146,386,740.95
  5. Step 5: Solve for x
    x = 146,386,740.95/13,707.50
  6. Step 6: Final answer
    x = 10,679.32

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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.