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Finding the Fourth Proportional to 12,465, 18,701.55 and 8,720.64

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Solution

The fourth proportional to 12,465, 18,701.55 and 8,720.64 is: 13,083.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,465 : 18,701.55 = 8,720.64 : x
  2. Step 2: Convert to fraction form
    12,465/18,701.55 = 8,720.64/x
  3. Step 3: Cross multiply
    12,465x = 18,701.55 × 8,720.64
  4. Step 4: Simplify right side
    12,465x = 163,089,484.99
  5. Step 5: Solve for x
    x = 163,089,484.99/12,465
  6. Step 6: Final answer
    x = 13,083.79

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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.