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Finding the Fourth Proportional to 15,312.50, 21,131.26 and 8,688.50

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Solution

The fourth proportional to 15,312.50, 21,131.26 and 8,688.50 is: 11,990.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,312.50 : 21,131.26 = 8,688.50 : x
  2. Step 2: Convert to fraction form
    15,312.50/21,131.26 = 8,688.50/x
  3. Step 3: Cross multiply
    15,312.50x = 21,131.26 × 8,688.50
  4. Step 4: Simplify right side
    15,312.50x = 183,598,952.51
  5. Step 5: Solve for x
    x = 183,598,952.51/15,312.50
  6. Step 6: Final answer
    x = 11,990.14

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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.