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Finding the Fourth Proportional to 61,351.76, 84,643.40 and 40,143.34

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Solution

The fourth proportional to 61,351.76, 84,643.40 and 40,143.34 is: 55,383.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,351.76 : 84,643.40 = 40,143.34 : x
  2. Step 2: Convert to fraction form
    61,351.76/84,643.40 = 40,143.34/x
  3. Step 3: Cross multiply
    61,351.76x = 84,643.40 × 40,143.34
  4. Step 4: Simplify right side
    61,351.76x = 3,397,868,784.96
  5. Step 5: Solve for x
    x = 3,397,868,784.96/61,351.76
  6. Step 6: Final answer
    x = 55,383.40

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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.