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Finding the Fourth Proportional to 85,955.60, 128,855.64 and 30,538.64

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Solution

The fourth proportional to 85,955.60, 128,855.64 and 30,538.64 is: 45,780.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,955.60 : 128,855.64 = 30,538.64 : x
  2. Step 2: Convert to fraction form
    85,955.60/128,855.64 = 30,538.64/x
  3. Step 3: Cross multiply
    85,955.60x = 128,855.64 × 30,538.64
  4. Step 4: Simplify right side
    85,955.60x = 3,935,076,001.93
  5. Step 5: Solve for x
    x = 3,935,076,001.93/85,955.60
  6. Step 6: Final answer
    x = 45,780.33

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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.