Home / 12,156.48-16,779.64-7,121.88

Finding the Fourth Proportional to 12,156.48, 16,779.64 and 7,121.88

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Solution

The fourth proportional to 12,156.48, 16,779.64 and 7,121.88 is: 9,830.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,156.48 : 16,779.64 = 7,121.88 : x
  2. Step 2: Convert to fraction form
    12,156.48/16,779.64 = 7,121.88/x
  3. Step 3: Cross multiply
    12,156.48x = 16,779.64 × 7,121.88
  4. Step 4: Simplify right side
    12,156.48x = 119,502,582.52
  5. Step 5: Solve for x
    x = 119,502,582.52/12,156.48
  6. Step 6: Final answer
    x = 9,830.36

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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.