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Finding the Fourth Proportional to 86,319, 128,872.98 and 73,036.56

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Solution

The fourth proportional to 86,319, 128,872.98 and 73,036.56 is: 109,042.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,319 : 128,872.98 = 73,036.56 : x
  2. Step 2: Convert to fraction form
    86,319/128,872.98 = 73,036.56/x
  3. Step 3: Cross multiply
    86,319x = 128,872.98 × 73,036.56
  4. Step 4: Simplify right side
    86,319x = 9,412,439,136.15
  5. Step 5: Solve for x
    x = 9,412,439,136.15/86,319
  6. Step 6: Final answer
    x = 109,042.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.