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Finding the Fourth Proportional to 31,128.80, 46,693.20 and 27,435.20

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Solution

The fourth proportional to 31,128.80, 46,693.20 and 27,435.20 is: 41,152.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,128.80 : 46,693.20 = 27,435.20 : x
  2. Step 2: Convert to fraction form
    31,128.80/46,693.20 = 27,435.20/x
  3. Step 3: Cross multiply
    31,128.80x = 46,693.20 × 27,435.20
  4. Step 4: Simplify right side
    31,128.80x = 1,281,037,280.64
  5. Step 5: Solve for x
    x = 1,281,037,280.64/31,128.80
  6. Step 6: Final answer
    x = 41,152.80

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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.