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Finding the Fourth Proportional to 13,980.10, 19,291.09 and 7,929.11

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Solution

The fourth proportional to 13,980.10, 19,291.09 and 7,929.11 is: 10,941.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,980.10 : 19,291.09 = 7,929.11 : x
  2. Step 2: Convert to fraction form
    13,980.10/19,291.09 = 7,929.11/x
  3. Step 3: Cross multiply
    13,980.10x = 19,291.09 × 7,929.11
  4. Step 4: Simplify right side
    13,980.10x = 152,961,174.63
  5. Step 5: Solve for x
    x = 152,961,174.63/13,980.10
  6. Step 6: Final answer
    x = 10,941.35

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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.