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Finding the Fourth Proportional to 387,840.99, 581,617.47 and 135,056.61

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Solution

The fourth proportional to 387,840.99, 581,617.47 and 135,056.61 is: 202,534.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,840.99 : 581,617.47 = 135,056.61 : x
  2. Step 2: Convert to fraction form
    387,840.99/581,617.47 = 135,056.61/x
  3. Step 3: Cross multiply
    387,840.99x = 581,617.47 × 135,056.61
  4. Step 4: Simplify right side
    387,840.99x = 78,551,283,814.98
  5. Step 5: Solve for x
    x = 78,551,283,814.98/387,840.99
  6. Step 6: Final answer
    x = 202,534.77

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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.