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Finding the Fourth Proportional to 20,870.64, 28,798.92 and 13,210.92

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Solution

The fourth proportional to 20,870.64, 28,798.92 and 13,210.92 is: 18,229.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.64 : 28,798.92 = 13,210.92 : x
  2. Step 2: Convert to fraction form
    20,870.64/28,798.92 = 13,210.92/x
  3. Step 3: Cross multiply
    20,870.64x = 28,798.92 × 13,210.92
  4. Step 4: Simplify right side
    20,870.64x = 380,460,228.21
  5. Step 5: Solve for x
    x = 380,460,228.21/20,870.64
  6. Step 6: Final answer
    x = 18,229.45

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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.