Home / 20,866.39-31,307.58-8,390.00

Finding the Fourth Proportional to 20,866.39, 31,307.58 and 8,390.00

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Solution

The fourth proportional to 20,866.39, 31,307.58 and 8,390.00 is: 12,588.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,866.39 : 31,307.58 = 8,390.00 : x
  2. Step 2: Convert to fraction form
    20,866.39/31,307.58 = 8,390.00/x
  3. Step 3: Cross multiply
    20,866.39x = 31,307.58 × 8,390.00
  4. Step 4: Simplify right side
    20,866.39x = 262,670,674.47
  5. Step 5: Solve for x
    x = 262,670,674.47/20,866.39
  6. Step 6: Final answer
    x = 12,588.22

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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.