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Finding the Fourth Proportional to 28,010.40, 42,015.60 and 21,098.40

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Solution

The fourth proportional to 28,010.40, 42,015.60 and 21,098.40 is: 31,647.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,010.40 : 42,015.60 = 21,098.40 : x
  2. Step 2: Convert to fraction form
    28,010.40/42,015.60 = 21,098.40/x
  3. Step 3: Cross multiply
    28,010.40x = 42,015.60 × 21,098.40
  4. Step 4: Simplify right side
    28,010.40x = 886,461,935.04
  5. Step 5: Solve for x
    x = 886,461,935.04/28,010.40
  6. Step 6: Final answer
    x = 31,647.60

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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.