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Finding the Fourth Proportional to 158,129.31, 218,218.35 and 86,509.35

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Solution

The fourth proportional to 158,129.31, 218,218.35 and 86,509.35 is: 119,382.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,129.31 : 218,218.35 = 86,509.35 : x
  2. Step 2: Convert to fraction form
    158,129.31/218,218.35 = 86,509.35/x
  3. Step 3: Cross multiply
    158,129.31x = 218,218.35 × 86,509.35
  4. Step 4: Simplify right side
    158,129.31x = 18,877,927,940.98
  5. Step 5: Solve for x
    x = 18,877,927,940.98/158,129.31
  6. Step 6: Final answer
    x = 119,382.85

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1.5x scale

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.