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Finding the Fourth Proportional to 13,386.91, 18,482.60 and 8,609

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Solution

The fourth proportional to 13,386.91, 18,482.60 and 8,609 is: 11,885.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,386.91 : 18,482.60 = 8,609 : x
  2. Step 2: Convert to fraction form
    13,386.91/18,482.60 = 8,609/x
  3. Step 3: Cross multiply
    13,386.91x = 18,482.60 × 8,609
  4. Step 4: Simplify right side
    13,386.91x = 159,116,703.40
  5. Step 5: Solve for x
    x = 159,116,703.40/13,386.91
  6. Step 6: Final answer
    x = 11,885.99

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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.