Home / 20,715.79-28,587.64-11,284.35

Finding the Fourth Proportional to 20,715.79, 28,587.64 and 11,284.35

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Solution

The fourth proportional to 20,715.79, 28,587.64 and 11,284.35 is: 15,572.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,715.79 : 28,587.64 = 11,284.35 : x
  2. Step 2: Convert to fraction form
    20,715.79/28,587.64 = 11,284.35/x
  3. Step 3: Cross multiply
    20,715.79x = 28,587.64 × 11,284.35
  4. Step 4: Simplify right side
    20,715.79x = 322,592,879.01
  5. Step 5: Solve for x
    x = 322,592,879.01/20,715.79
  6. Step 6: Final answer
    x = 15,572.32

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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.