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Finding the Fourth Proportional to 13,616.28, 18,762.48 and 9,368.64

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Solution

The fourth proportional to 13,616.28, 18,762.48 and 9,368.64 is: 12,909.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,616.28 : 18,762.48 = 9,368.64 : x
  2. Step 2: Convert to fraction form
    13,616.28/18,762.48 = 9,368.64/x
  3. Step 3: Cross multiply
    13,616.28x = 18,762.48 × 9,368.64
  4. Step 4: Simplify right side
    13,616.28x = 175,778,920.63
  5. Step 5: Solve for x
    x = 175,778,920.63/13,616.28
  6. Step 6: Final answer
    x = 12,909.47

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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.