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Finding the Fourth Proportional to 28,761.60, 43,142.40 and 19,430.40

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Solution

The fourth proportional to 28,761.60, 43,142.40 and 19,430.40 is: 29,145.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,761.60 : 43,142.40 = 19,430.40 : x
  2. Step 2: Convert to fraction form
    28,761.60/43,142.40 = 19,430.40/x
  3. Step 3: Cross multiply
    28,761.60x = 43,142.40 × 19,430.40
  4. Step 4: Simplify right side
    28,761.60x = 838,274,088.96
  5. Step 5: Solve for x
    x = 838,274,088.96/28,761.60
  6. Step 6: Final answer
    x = 29,145.60

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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.