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Finding the Fourth Proportional to 9,903, 13,666.16 and 5,487

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Solution

The fourth proportional to 9,903, 13,666.16 and 5,487 is: 7,572.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,903 : 13,666.16 = 5,487 : x
  2. Step 2: Convert to fraction form
    9,903/13,666.16 = 5,487/x
  3. Step 3: Cross multiply
    9,903x = 13,666.16 × 5,487
  4. Step 4: Simplify right side
    9,903x = 74,986,219.92
  5. Step 5: Solve for x
    x = 74,986,219.92/9,903
  6. Step 6: Final answer
    x = 7,572.07

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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.