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Finding the Fourth Proportional to 86,005.80, 128,987.10 and 30,588.84

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Solution

The fourth proportional to 86,005.80, 128,987.10 and 30,588.84 is: 45,875.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,005.80 : 128,987.10 = 30,588.84 : x
  2. Step 2: Convert to fraction form
    86,005.80/128,987.10 = 30,588.84/x
  3. Step 3: Cross multiply
    86,005.80x = 128,987.10 × 30,588.84
  4. Step 4: Simplify right side
    86,005.80x = 3,945,565,763.96
  5. Step 5: Solve for x
    x = 3,945,565,763.96/86,005.80
  6. Step 6: Final answer
    x = 45,875.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.