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Finding the Fourth Proportional to 21,759.76, 30,030.88 and 12,328.96

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Solution

The fourth proportional to 21,759.76, 30,030.88 and 12,328.96 is: 17,015.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,759.76 : 30,030.88 = 12,328.96 : x
  2. Step 2: Convert to fraction form
    21,759.76/30,030.88 = 12,328.96/x
  3. Step 3: Cross multiply
    21,759.76x = 30,030.88 × 12,328.96
  4. Step 4: Simplify right side
    21,759.76x = 370,249,518.28
  5. Step 5: Solve for x
    x = 370,249,518.28/21,759.76
  6. Step 6: Final answer
    x = 17,015.33

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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.