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Finding the Fourth Proportional to 8,759.60, 13,128.45 and 4,378.28

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Solution

The fourth proportional to 8,759.60, 13,128.45 and 4,378.28 is: 6,561.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,759.60 : 13,128.45 = 4,378.28 : x
  2. Step 2: Convert to fraction form
    8,759.60/13,128.45 = 4,378.28/x
  3. Step 3: Cross multiply
    8,759.60x = 13,128.45 × 4,378.28
  4. Step 4: Simplify right side
    8,759.60x = 57,480,030.07
  5. Step 5: Solve for x
    x = 57,480,030.07/8,759.60
  6. Step 6: Final answer
    x = 6,561.95

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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.