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Finding the Fourth Proportional to 78,640.80, 108,525.60 and 42,831.51

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Solution

The fourth proportional to 78,640.80, 108,525.60 and 42,831.51 is: 59,108.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,640.80 : 108,525.60 = 42,831.51 : x
  2. Step 2: Convert to fraction form
    78,640.80/108,525.60 = 42,831.51/x
  3. Step 3: Cross multiply
    78,640.80x = 108,525.60 × 42,831.51
  4. Step 4: Simplify right side
    78,640.80x = 4,648,315,321.66
  5. Step 5: Solve for x
    x = 4,648,315,321.66/78,640.80
  6. Step 6: Final answer
    x = 59,108.19

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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.