Home / 21,688.16-29,712.32-20,878.67

Finding the Fourth Proportional to 21,688.16, 29,712.32 and 20,878.67

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Solution

The fourth proportional to 21,688.16, 29,712.32 and 20,878.67 is: 28,603.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,688.16 : 29,712.32 = 20,878.67 : x
  2. Step 2: Convert to fraction form
    21,688.16/29,712.32 = 20,878.67/x
  3. Step 3: Cross multiply
    21,688.16x = 29,712.32 × 20,878.67
  4. Step 4: Simplify right side
    21,688.16x = 620,353,471.26
  5. Step 5: Solve for x
    x = 620,353,471.26/21,688.16
  6. Step 6: Final answer
    x = 28,603.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.