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Finding the Fourth Proportional to 15,585.89, 21,504.89 and 8,870.99

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Solution

The fourth proportional to 15,585.89, 21,504.89 and 8,870.99 is: 12,239.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,585.89 : 21,504.89 = 8,870.99 : x
  2. Step 2: Convert to fraction form
    15,585.89/21,504.89 = 8,870.99/x
  3. Step 3: Cross multiply
    15,585.89x = 21,504.89 × 8,870.99
  4. Step 4: Simplify right side
    15,585.89x = 190,769,578.79
  5. Step 5: Solve for x
    x = 190,769,578.79/15,585.89
  6. Step 6: Final answer
    x = 12,239.89

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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.