Home / 20,865.30-31,111.83-18,547.08

Finding the Fourth Proportional to 20,865.30, 31,111.83 and 18,547.08

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Solution

The fourth proportional to 20,865.30, 31,111.83 and 18,547.08 is: 27,655.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,865.30 : 31,111.83 = 18,547.08 : x
  2. Step 2: Convert to fraction form
    20,865.30/31,111.83 = 18,547.08/x
  3. Step 3: Cross multiply
    20,865.30x = 31,111.83 × 18,547.08
  4. Step 4: Simplify right side
    20,865.30x = 577,033,599.96
  5. Step 5: Solve for x
    x = 577,033,599.96/20,865.30
  6. Step 6: Final answer
    x = 27,655.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.