Home / 21,128.75-29,123.96-14,320.63

Finding the Fourth Proportional to 21,128.75, 29,123.96 and 14,320.63

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Solution

The fourth proportional to 21,128.75, 29,123.96 and 14,320.63 is: 19,739.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.75 : 29,123.96 = 14,320.63 : x
  2. Step 2: Convert to fraction form
    21,128.75/29,123.96 = 14,320.63/x
  3. Step 3: Cross multiply
    21,128.75x = 29,123.96 × 14,320.63
  4. Step 4: Simplify right side
    21,128.75x = 417,073,420.10
  5. Step 5: Solve for x
    x = 417,073,420.10/21,128.75
  6. Step 6: Final answer
    x = 19,739.62

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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.