Home / 21,139.60-31,681.89-8,645.35

Finding the Fourth Proportional to 21,139.60, 31,681.89 and 8,645.35

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Solution

The fourth proportional to 21,139.60, 31,681.89 and 8,645.35 is: 12,956.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.60 : 31,681.89 = 8,645.35 : x
  2. Step 2: Convert to fraction form
    21,139.60/31,681.89 = 8,645.35/x
  3. Step 3: Cross multiply
    21,139.60x = 31,681.89 × 8,645.35
  4. Step 4: Simplify right side
    21,139.60x = 273,901,027.71
  5. Step 5: Solve for x
    x = 273,901,027.71/21,139.60
  6. Step 6: Final answer
    x = 12,956.77

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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.