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Finding the Fourth Proportional to 218,840.67, 328,129.65 and 85,562.19

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Solution

The fourth proportional to 218,840.67, 328,129.65 and 85,562.19 is: 128,291.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,840.67 : 328,129.65 = 85,562.19 : x
  2. Step 2: Convert to fraction form
    218,840.67/328,129.65 = 85,562.19/x
  3. Step 3: Cross multiply
    218,840.67x = 328,129.65 × 85,562.19
  4. Step 4: Simplify right side
    218,840.67x = 28,075,491,457.93
  5. Step 5: Solve for x
    x = 28,075,491,457.93/218,840.67
  6. Step 6: Final answer
    x = 128,291.93

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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.