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Finding the Fourth Proportional to 218,739.83, 328,137.08 and 85,602.87

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Solution

The fourth proportional to 218,739.83, 328,137.08 and 85,602.87 is: 128,415.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,739.83 : 328,137.08 = 85,602.87 : x
  2. Step 2: Convert to fraction form
    218,739.83/328,137.08 = 85,602.87/x
  3. Step 3: Cross multiply
    218,739.83x = 328,137.08 × 85,602.87
  4. Step 4: Simplify right side
    218,739.83x = 28,089,475,373.41
  5. Step 5: Solve for x
    x = 28,089,475,373.41/218,739.83
  6. Step 6: Final answer
    x = 128,415.00

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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.