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Finding the Fourth Proportional to 12,389.60, 18,584.40 and 5,808.08

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Solution

The fourth proportional to 12,389.60, 18,584.40 and 5,808.08 is: 8,712.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,389.60 : 18,584.40 = 5,808.08 : x
  2. Step 2: Convert to fraction form
    12,389.60/18,584.40 = 5,808.08/x
  3. Step 3: Cross multiply
    12,389.60x = 18,584.40 × 5,808.08
  4. Step 4: Simplify right side
    12,389.60x = 107,939,681.95
  5. Step 5: Solve for x
    x = 107,939,681.95/12,389.60
  6. Step 6: Final answer
    x = 8,712.12

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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.