Home / 20,710.80-28,561.12-13,920.16

Finding the Fourth Proportional to 20,710.80, 28,561.12 and 13,920.16

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Solution

The fourth proportional to 20,710.80, 28,561.12 and 13,920.16 is: 19,196.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,710.80 : 28,561.12 = 13,920.16 : x
  2. Step 2: Convert to fraction form
    20,710.80/28,561.12 = 13,920.16/x
  3. Step 3: Cross multiply
    20,710.80x = 28,561.12 × 13,920.16
  4. Step 4: Simplify right side
    20,710.80x = 397,575,360.18
  5. Step 5: Solve for x
    x = 397,575,360.18/20,710.80
  6. Step 6: Final answer
    x = 19,196.52

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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.