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Finding the Fourth Proportional to 86,671, 130,006.50 and 21,007

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Solution

The fourth proportional to 86,671, 130,006.50 and 21,007 is: 31,510.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,671 : 130,006.50 = 21,007 : x
  2. Step 2: Convert to fraction form
    86,671/130,006.50 = 21,007/x
  3. Step 3: Cross multiply
    86,671x = 130,006.50 × 21,007
  4. Step 4: Simplify right side
    86,671x = 2,731,046,545.50
  5. Step 5: Solve for x
    x = 2,731,046,545.50/86,671
  6. Step 6: Final answer
    x = 31,510.50

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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.