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Finding the Fourth Proportional to 8,859.20, 13,289.76 and 3,315.20

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Solution

The fourth proportional to 8,859.20, 13,289.76 and 3,315.20 is: 4,973.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,859.20 : 13,289.76 = 3,315.20 : x
  2. Step 2: Convert to fraction form
    8,859.20/13,289.76 = 3,315.20/x
  3. Step 3: Cross multiply
    8,859.20x = 13,289.76 × 3,315.20
  4. Step 4: Simplify right side
    8,859.20x = 44,058,212.35
  5. Step 5: Solve for x
    x = 44,058,212.35/8,859.20
  6. Step 6: Final answer
    x = 4,973.16

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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.