Home / 12,279.47-18,420.75-4,783.20

Finding the Fourth Proportional to 12,279.47, 18,420.75 and 4,783.20

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Solution

The fourth proportional to 12,279.47, 18,420.75 and 4,783.20 is: 7,175.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,279.47 : 18,420.75 = 4,783.20 : x
  2. Step 2: Convert to fraction form
    12,279.47/18,420.75 = 4,783.20/x
  3. Step 3: Cross multiply
    12,279.47x = 18,420.75 × 4,783.20
  4. Step 4: Simplify right side
    12,279.47x = 88,110,044.39
  5. Step 5: Solve for x
    x = 88,110,044.39/12,279.47
  6. Step 6: Final answer
    x = 7,175.40

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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.