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Finding the Fourth Proportional to 28,403.60, 42,621.60 and 19,644.80

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Solution

The fourth proportional to 28,403.60, 42,621.60 and 19,644.80 is: 29,478.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,403.60 : 42,621.60 = 19,644.80 : x
  2. Step 2: Convert to fraction form
    28,403.60/42,621.60 = 19,644.80/x
  3. Step 3: Cross multiply
    28,403.60x = 42,621.60 × 19,644.80
  4. Step 4: Simplify right side
    28,403.60x = 837,292,807.68
  5. Step 5: Solve for x
    x = 837,292,807.68/28,403.60
  6. Step 6: Final answer
    x = 29,478.40

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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.