Home / 20,257.60-30,386.40-13,259.20

Finding the Fourth Proportional to 20,257.60, 30,386.40 and 13,259.20

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Solution

The fourth proportional to 20,257.60, 30,386.40 and 13,259.20 is: 19,888.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,257.60 : 30,386.40 = 13,259.20 : x
  2. Step 2: Convert to fraction form
    20,257.60/30,386.40 = 13,259.20/x
  3. Step 3: Cross multiply
    20,257.60x = 30,386.40 × 13,259.20
  4. Step 4: Simplify right side
    20,257.60x = 402,899,354.88
  5. Step 5: Solve for x
    x = 402,899,354.88/20,257.60
  6. Step 6: Final answer
    x = 19,888.80

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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.