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Finding the Fourth Proportional to 218,903.70, 328,355.55 and 85,739.70

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Solution

The fourth proportional to 218,903.70, 328,355.55 and 85,739.70 is: 128,609.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,903.70 : 328,355.55 = 85,739.70 : x
  2. Step 2: Convert to fraction form
    218,903.70/328,355.55 = 85,739.70/x
  3. Step 3: Cross multiply
    218,903.70x = 328,355.55 × 85,739.70
  4. Step 4: Simplify right side
    218,903.70x = 28,153,106,350.34
  5. Step 5: Solve for x
    x = 28,153,106,350.34/218,903.70
  6. Step 6: Final answer
    x = 128,609.55

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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.