Home / 15,782.40-21,779.28-8,708.31

Finding the Fourth Proportional to 15,782.40, 21,779.28 and 8,708.31

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Solution

The fourth proportional to 15,782.40, 21,779.28 and 8,708.31 is: 12,017.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,782.40 : 21,779.28 = 8,708.31 : x
  2. Step 2: Convert to fraction form
    15,782.40/21,779.28 = 8,708.31/x
  3. Step 3: Cross multiply
    15,782.40x = 21,779.28 × 8,708.31
  4. Step 4: Simplify right side
    15,782.40x = 189,660,721.82
  5. Step 5: Solve for x
    x = 189,660,721.82/15,782.40
  6. Step 6: Final answer
    x = 12,017.23

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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.