Home / 21,215.79-29,285.96-14,139.63

Finding the Fourth Proportional to 21,215.79, 29,285.96 and 14,139.63

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Solution

The fourth proportional to 21,215.79, 29,285.96 and 14,139.63 is: 19,518.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,215.79 : 29,285.96 = 14,139.63 : x
  2. Step 2: Convert to fraction form
    21,215.79/29,285.96 = 14,139.63/x
  3. Step 3: Cross multiply
    21,215.79x = 29,285.96 × 14,139.63
  4. Step 4: Simplify right side
    21,215.79x = 414,092,567.90
  5. Step 5: Solve for x
    x = 414,092,567.90/21,215.79
  6. Step 6: Final answer
    x = 19,518.13

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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.