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Finding the Fourth Proportional to 72,085.60, 108,128.40 and 40,981.60

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Solution

The fourth proportional to 72,085.60, 108,128.40 and 40,981.60 is: 61,472.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,085.60 : 108,128.40 = 40,981.60 : x
  2. Step 2: Convert to fraction form
    72,085.60/108,128.40 = 40,981.60/x
  3. Step 3: Cross multiply
    72,085.60x = 108,128.40 × 40,981.60
  4. Step 4: Simplify right side
    72,085.60x = 4,431,274,837.44
  5. Step 5: Solve for x
    x = 4,431,274,837.44/72,085.60
  6. Step 6: Final answer
    x = 61,472.40

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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.