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Finding the Fourth Proportional to 12,938,658.40, 19,407,987.60 and 10,419,234.40

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Solution

The fourth proportional to 12,938,658.40, 19,407,987.60 and 10,419,234.40 is: 15,628,851.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,938,658.40 : 19,407,987.60 = 10,419,234.40 : x
  2. Step 2: Convert to fraction form
    12,938,658.40/19,407,987.60 = 10,419,234.40/x
  3. Step 3: Cross multiply
    12,938,658.40x = 19,407,987.60 × 10,419,234.40
  4. Step 4: Simplify right side
    12,938,658.40x = 202,216,372,036,693.47
  5. Step 5: Solve for x
    x = 202,216,372,036,693.47/12,938,658.40
  6. Step 6: Final answer
    x = 15,628,851.60

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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.