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Finding the Fourth Proportional to 15,699.79, 21,675.72 and 10,918

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Solution

The fourth proportional to 15,699.79, 21,675.72 and 10,918 is: 15,073.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,699.79 : 21,675.72 = 10,918 : x
  2. Step 2: Convert to fraction form
    15,699.79/21,675.72 = 10,918/x
  3. Step 3: Cross multiply
    15,699.79x = 21,675.72 × 10,918
  4. Step 4: Simplify right side
    15,699.79x = 236,655,510.96
  5. Step 5: Solve for x
    x = 236,655,510.96/15,699.79
  6. Step 6: Final answer
    x = 15,073.80

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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.