Home / 13,689.07-18,881.30-8,386.47

Finding the Fourth Proportional to 13,689.07, 18,881.30 and 8,386.47

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Solution

The fourth proportional to 13,689.07, 18,881.30 and 8,386.47 is: 11,567.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.07 : 18,881.30 = 8,386.47 : x
  2. Step 2: Convert to fraction form
    13,689.07/18,881.30 = 8,386.47/x
  3. Step 3: Cross multiply
    13,689.07x = 18,881.30 × 8,386.47
  4. Step 4: Simplify right side
    13,689.07x = 158,347,476.98
  5. Step 5: Solve for x
    x = 158,347,476.98/13,689.07
  6. Step 6: Final answer
    x = 11,567.44

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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.