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Finding the Fourth Proportional to 13,967.70, 20,866.68 and 9,987.36

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Solution

The fourth proportional to 13,967.70, 20,866.68 and 9,987.36 is: 14,920.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,967.70 : 20,866.68 = 9,987.36 : x
  2. Step 2: Convert to fraction form
    13,967.70/20,866.68 = 9,987.36/x
  3. Step 3: Cross multiply
    13,967.70x = 20,866.68 × 9,987.36
  4. Step 4: Simplify right side
    13,967.70x = 208,403,045.16
  5. Step 5: Solve for x
    x = 208,403,045.16/13,967.70
  6. Step 6: Final answer
    x = 14,920.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.