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Finding the Fourth Proportional to 155,699.84, 214,821.34 and 87,693.05

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Solution

The fourth proportional to 155,699.84, 214,821.34 and 87,693.05 is: 120,991.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,699.84 : 214,821.34 = 87,693.05 : x
  2. Step 2: Convert to fraction form
    155,699.84/214,821.34 = 87,693.05/x
  3. Step 3: Cross multiply
    155,699.84x = 214,821.34 × 87,693.05
  4. Step 4: Simplify right side
    155,699.84x = 18,838,338,827.51
  5. Step 5: Solve for x
    x = 18,838,338,827.51/155,699.84
  6. Step 6: Final answer
    x = 120,991.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.