Home / 21,128.46-31,690.24-5,547.30

Finding the Fourth Proportional to 21,128.46, 31,690.24 and 5,547.30

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Solution

The fourth proportional to 21,128.46, 31,690.24 and 5,547.30 is: 8,320.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.46 : 31,690.24 = 5,547.30 : x
  2. Step 2: Convert to fraction form
    21,128.46/31,690.24 = 5,547.30/x
  3. Step 3: Cross multiply
    21,128.46x = 31,690.24 × 5,547.30
  4. Step 4: Simplify right side
    21,128.46x = 175,795,268.35
  5. Step 5: Solve for x
    x = 175,795,268.35/21,128.46
  6. Step 6: Final answer
    x = 8,320.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.