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Finding the Fourth Proportional to 155,987.82, 215,263.80 and 84,368.34

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Solution

The fourth proportional to 155,987.82, 215,263.80 and 84,368.34 is: 116,428.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,987.82 : 215,263.80 = 84,368.34 : x
  2. Step 2: Convert to fraction form
    155,987.82/215,263.80 = 84,368.34/x
  3. Step 3: Cross multiply
    155,987.82x = 215,263.80 × 84,368.34
  4. Step 4: Simplify right side
    155,987.82x = 18,161,449,468.09
  5. Step 5: Solve for x
    x = 18,161,449,468.09/155,987.82
  6. Step 6: Final answer
    x = 116,428.64

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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.