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Finding the Fourth Proportional to 153,185, 211,395.30 and 86,117.48

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Solution

The fourth proportional to 153,185, 211,395.30 and 86,117.48 is: 118,842.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,185 : 211,395.30 = 86,117.48 : x
  2. Step 2: Convert to fraction form
    153,185/211,395.30 = 86,117.48/x
  3. Step 3: Cross multiply
    153,185x = 211,395.30 × 86,117.48
  4. Step 4: Simplify right side
    153,185x = 18,204,830,519.84
  5. Step 5: Solve for x
    x = 18,204,830,519.84/153,185
  6. Step 6: Final answer
    x = 118,842.12

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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.