Home / 13,938.90-19,235.31-7,971.17

Finding the Fourth Proportional to 13,938.90, 19,235.31 and 7,971.17

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Solution

The fourth proportional to 13,938.90, 19,235.31 and 7,971.17 is: 10,999.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,938.90 : 19,235.31 = 7,971.17 : x
  2. Step 2: Convert to fraction form
    13,938.90/19,235.31 = 7,971.17/x
  3. Step 3: Cross multiply
    13,938.90x = 19,235.31 × 7,971.17
  4. Step 4: Simplify right side
    13,938.90x = 153,327,829.84
  5. Step 5: Solve for x
    x = 153,327,829.84/13,938.90
  6. Step 6: Final answer
    x = 10,999.99

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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.