Home / 21,187.81-31,771.60-7,851.65

Finding the Fourth Proportional to 21,187.81, 31,771.60 and 7,851.65

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Solution

The fourth proportional to 21,187.81, 31,771.60 and 7,851.65 is: 11,773.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,187.81 : 31,771.60 = 7,851.65 : x
  2. Step 2: Convert to fraction form
    21,187.81/31,771.60 = 7,851.65/x
  3. Step 3: Cross multiply
    21,187.81x = 31,771.60 × 7,851.65
  4. Step 4: Simplify right side
    21,187.81x = 249,459,483.14
  5. Step 5: Solve for x
    x = 249,459,483.14/21,187.81
  6. Step 6: Final answer
    x = 11,773.73

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1.5x scale

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.