Home / 20,870.31-28,784.25-18,347.07

Finding the Fourth Proportional to 20,870.31, 28,784.25 and 18,347.07

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Solution

The fourth proportional to 20,870.31, 28,784.25 and 18,347.07 is: 25,304.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.31 : 28,784.25 = 18,347.07 : x
  2. Step 2: Convert to fraction form
    20,870.31/28,784.25 = 18,347.07/x
  3. Step 3: Cross multiply
    20,870.31x = 28,784.25 × 18,347.07
  4. Step 4: Simplify right side
    20,870.31x = 528,106,649.65
  5. Step 5: Solve for x
    x = 528,106,649.65/20,870.31
  6. Step 6: Final answer
    x = 25,304.21

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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.