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Finding the Fourth Proportional to 9,886, 13,642.68 and 5,470

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Solution

The fourth proportional to 9,886, 13,642.68 and 5,470 is: 7,548.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,886 : 13,642.68 = 5,470 : x
  2. Step 2: Convert to fraction form
    9,886/13,642.68 = 5,470/x
  3. Step 3: Cross multiply
    9,886x = 13,642.68 × 5,470
  4. Step 4: Simplify right side
    9,886x = 74,625,459.60
  5. Step 5: Solve for x
    x = 74,625,459.60/9,886
  6. Step 6: Final answer
    x = 7,548.60

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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.