Home / 20,347.40-28,079.16-12,389.60

Finding the Fourth Proportional to 20,347.40, 28,079.16 and 12,389.60

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Solution

The fourth proportional to 20,347.40, 28,079.16 and 12,389.60 is: 17,097.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,347.40 : 28,079.16 = 12,389.60 : x
  2. Step 2: Convert to fraction form
    20,347.40/28,079.16 = 12,389.60/x
  3. Step 3: Cross multiply
    20,347.40x = 28,079.16 × 12,389.60
  4. Step 4: Simplify right side
    20,347.40x = 347,889,560.74
  5. Step 5: Solve for x
    x = 347,889,560.74/20,347.40
  6. Step 6: Final answer
    x = 17,097.49

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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.