Home / 21,285.31-29,359.66-13,313.70

Finding the Fourth Proportional to 21,285.31, 29,359.66 and 13,313.70

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Solution

The fourth proportional to 21,285.31, 29,359.66 and 13,313.70 is: 18,364.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,285.31 : 29,359.66 = 13,313.70 : x
  2. Step 2: Convert to fraction form
    21,285.31/29,359.66 = 13,313.70/x
  3. Step 3: Cross multiply
    21,285.31x = 29,359.66 × 13,313.70
  4. Step 4: Simplify right side
    21,285.31x = 390,885,705.34
  5. Step 5: Solve for x
    x = 390,885,705.34/21,285.31
  6. Step 6: Final answer
    x = 18,364.11

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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.