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Finding the Fourth Proportional to 18,752.64, 28,128.32 and 6,440.32

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Solution

The fourth proportional to 18,752.64, 28,128.32 and 6,440.32 is: 9,660.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,752.64 : 28,128.32 = 6,440.32 : x
  2. Step 2: Convert to fraction form
    18,752.64/28,128.32 = 6,440.32/x
  3. Step 3: Cross multiply
    18,752.64x = 28,128.32 × 6,440.32
  4. Step 4: Simplify right side
    18,752.64x = 181,155,381.86
  5. Step 5: Solve for x
    x = 181,155,381.86/18,752.64
  6. Step 6: Final answer
    x = 9,660.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.