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Finding the Fourth Proportional to 219,859.65, 329,690.93 and 86,671.35

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Solution

The fourth proportional to 219,859.65, 329,690.93 and 86,671.35 is: 129,968.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,859.65 : 329,690.93 = 86,671.35 : x
  2. Step 2: Convert to fraction form
    219,859.65/329,690.93 = 86,671.35/x
  3. Step 3: Cross multiply
    219,859.65x = 329,690.93 × 86,671.35
  4. Step 4: Simplify right side
    219,859.65x = 28,574,757,552.50
  5. Step 5: Solve for x
    x = 28,574,757,552.50/219,859.65
  6. Step 6: Final answer
    x = 129,968.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.