Home / 12,985.40-19,478.10-4,220.20

Finding the Fourth Proportional to 12,985.40, 19,478.10 and 4,220.20

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Solution

The fourth proportional to 12,985.40, 19,478.10 and 4,220.20 is: 6,330.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,985.40 : 19,478.10 = 4,220.20 : x
  2. Step 2: Convert to fraction form
    12,985.40/19,478.10 = 4,220.20/x
  3. Step 3: Cross multiply
    12,985.40x = 19,478.10 × 4,220.20
  4. Step 4: Simplify right side
    12,985.40x = 82,201,477.62
  5. Step 5: Solve for x
    x = 82,201,477.62/12,985.40
  6. Step 6: Final answer
    x = 6,330.30

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Similar ratio
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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.