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Finding the Fourth Proportional to 78,707.90, 108,619.27 and 42,900.23

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Solution

The fourth proportional to 78,707.90, 108,619.27 and 42,900.23 is: 59,203.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,707.90 : 108,619.27 = 42,900.23 : x
  2. Step 2: Convert to fraction form
    78,707.90/108,619.27 = 42,900.23/x
  3. Step 3: Cross multiply
    78,707.90x = 108,619.27 × 42,900.23
  4. Step 4: Simplify right side
    78,707.90x = 4,659,791,665.43
  5. Step 5: Solve for x
    x = 4,659,791,665.43/78,707.90
  6. Step 6: Final answer
    x = 59,203.61

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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.