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Finding the Fourth Proportional to 65,707.88, 90,645.16 and 43,036.90

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Solution

The fourth proportional to 65,707.88, 90,645.16 and 43,036.90 is: 59,370.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,707.88 : 90,645.16 = 43,036.90 : x
  2. Step 2: Convert to fraction form
    65,707.88/90,645.16 = 43,036.90/x
  3. Step 3: Cross multiply
    65,707.88x = 90,645.16 × 43,036.90
  4. Step 4: Simplify right side
    65,707.88x = 3,901,086,686.40
  5. Step 5: Solve for x
    x = 3,901,086,686.40/65,707.88
  6. Step 6: Final answer
    x = 59,370.15

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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.