Home / 86,118.48-118,708.20-78,886.80

Finding the Fourth Proportional to 86,118.48, 118,708.20 and 78,886.80

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Solution

The fourth proportional to 86,118.48, 118,708.20 and 78,886.80 is: 108,739.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,118.48 : 118,708.20 = 78,886.80 : x
  2. Step 2: Convert to fraction form
    86,118.48/118,708.20 = 78,886.80/x
  3. Step 3: Cross multiply
    86,118.48x = 118,708.20 × 78,886.80
  4. Step 4: Simplify right side
    86,118.48x = 9,364,510,031.76
  5. Step 5: Solve for x
    x = 9,364,510,031.76/86,118.48
  6. Step 6: Final answer
    x = 108,739.84

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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.