Home / 21,854.51-30,158.35-12,904.90

Finding the Fourth Proportional to 21,854.51, 30,158.35 and 12,904.90

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Solution

The fourth proportional to 21,854.51, 30,158.35 and 12,904.90 is: 17,808.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,854.51 : 30,158.35 = 12,904.90 : x
  2. Step 2: Convert to fraction form
    21,854.51/30,158.35 = 12,904.90/x
  3. Step 3: Cross multiply
    21,854.51x = 30,158.35 × 12,904.90
  4. Step 4: Simplify right side
    21,854.51x = 389,190,431.65
  5. Step 5: Solve for x
    x = 389,190,431.65/21,854.51
  6. Step 6: Final answer
    x = 17,808.24

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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.