Home / 21,779.20-30,055.72-12,347.60

Finding the Fourth Proportional to 21,779.20, 30,055.72 and 12,347.60

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Solution

The fourth proportional to 21,779.20, 30,055.72 and 12,347.60 is: 17,039.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,779.20 : 30,055.72 = 12,347.60 : x
  2. Step 2: Convert to fraction form
    21,779.20/30,055.72 = 12,347.60/x
  3. Step 3: Cross multiply
    21,779.20x = 30,055.72 × 12,347.60
  4. Step 4: Simplify right side
    21,779.20x = 371,116,008.27
  5. Step 5: Solve for x
    x = 371,116,008.27/21,779.20
  6. Step 6: Final answer
    x = 17,039.93

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1.5x scale

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.