Home / 28,259.60-42,389.40-21,718.80

Finding the Fourth Proportional to 28,259.60, 42,389.40 and 21,718.80

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Solution

The fourth proportional to 28,259.60, 42,389.40 and 21,718.80 is: 32,578.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,259.60 : 42,389.40 = 21,718.80 : x
  2. Step 2: Convert to fraction form
    28,259.60/42,389.40 = 21,718.80/x
  3. Step 3: Cross multiply
    28,259.60x = 42,389.40 × 21,718.80
  4. Step 4: Simplify right side
    28,259.60x = 920,646,900.72
  5. Step 5: Solve for x
    x = 920,646,900.72/28,259.60
  6. Step 6: Final answer
    x = 32,578.20

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1.5x scale

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.