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Finding the Fourth Proportional to 84,980.79, 127,391.43 and 28,781.55

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Solution

The fourth proportional to 84,980.79, 127,391.43 and 28,781.55 is: 43,145.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,980.79 : 127,391.43 = 28,781.55 : x
  2. Step 2: Convert to fraction form
    84,980.79/127,391.43 = 28,781.55/x
  3. Step 3: Cross multiply
    84,980.79x = 127,391.43 × 28,781.55
  4. Step 4: Simplify right side
    84,980.79x = 3,666,522,812.12
  5. Step 5: Solve for x
    x = 3,666,522,812.12/84,980.79
  6. Step 6: Final answer
    x = 43,145.31

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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.