Home / 15,779.40-23,669.10-7,987.20

Finding the Fourth Proportional to 15,779.40, 23,669.10 and 7,987.20

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Solution

The fourth proportional to 15,779.40, 23,669.10 and 7,987.20 is: 11,980.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,779.40 : 23,669.10 = 7,987.20 : x
  2. Step 2: Convert to fraction form
    15,779.40/23,669.10 = 7,987.20/x
  3. Step 3: Cross multiply
    15,779.40x = 23,669.10 × 7,987.20
  4. Step 4: Simplify right side
    15,779.40x = 189,049,835.52
  5. Step 5: Solve for x
    x = 189,049,835.52/15,779.40
  6. Step 6: Final answer
    x = 11,980.80

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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.