Home / 20,565.16-28,379.80-11,133.72

Finding the Fourth Proportional to 20,565.16, 28,379.80 and 11,133.72

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Solution

The fourth proportional to 20,565.16, 28,379.80 and 11,133.72 is: 15,364.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,565.16 : 28,379.80 = 11,133.72 : x
  2. Step 2: Convert to fraction form
    20,565.16/28,379.80 = 11,133.72/x
  3. Step 3: Cross multiply
    20,565.16x = 28,379.80 × 11,133.72
  4. Step 4: Simplify right side
    20,565.16x = 315,972,746.86
  5. Step 5: Solve for x
    x = 315,972,746.86/20,565.16
  6. Step 6: Final answer
    x = 15,364.47

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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.