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Finding the Fourth Proportional to 28,647.60, 42,971.40 and 19,316.40

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Solution

The fourth proportional to 28,647.60, 42,971.40 and 19,316.40 is: 28,974.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,647.60 : 42,971.40 = 19,316.40 : x
  2. Step 2: Convert to fraction form
    28,647.60/42,971.40 = 19,316.40/x
  3. Step 3: Cross multiply
    28,647.60x = 42,971.40 × 19,316.40
  4. Step 4: Simplify right side
    28,647.60x = 830,052,750.96
  5. Step 5: Solve for x
    x = 830,052,750.96/28,647.60
  6. Step 6: Final answer
    x = 28,974.60

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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.