Home / 21,090-29,084.40-13,530.51

Finding the Fourth Proportional to 21,090, 29,084.40 and 13,530.51

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Solution

The fourth proportional to 21,090, 29,084.40 and 13,530.51 is: 18,659.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,090 : 29,084.40 = 13,530.51 : x
  2. Step 2: Convert to fraction form
    21,090/29,084.40 = 13,530.51/x
  3. Step 3: Cross multiply
    21,090x = 29,084.40 × 13,530.51
  4. Step 4: Simplify right side
    21,090x = 393,526,765.04
  5. Step 5: Solve for x
    x = 393,526,765.04/21,090
  6. Step 6: Final answer
    x = 18,659.40

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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.