Home / 20,779.95-28,646.69-12,816.84

Finding the Fourth Proportional to 20,779.95, 28,646.69 and 12,816.84

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Solution

The fourth proportional to 20,779.95, 28,646.69 and 12,816.84 is: 17,668.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.95 : 28,646.69 = 12,816.84 : x
  2. Step 2: Convert to fraction form
    20,779.95/28,646.69 = 12,816.84/x
  3. Step 3: Cross multiply
    20,779.95x = 28,646.69 × 12,816.84
  4. Step 4: Simplify right side
    20,779.95x = 367,159,978.18
  5. Step 5: Solve for x
    x = 367,159,978.18/20,779.95
  6. Step 6: Final answer
    x = 17,668.95

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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.