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Finding the Fourth Proportional to 86,119.20, 128,498.40 and 74,455.20

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Solution

The fourth proportional to 86,119.20, 128,498.40 and 74,455.20 is: 111,094.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,119.20 : 128,498.40 = 74,455.20 : x
  2. Step 2: Convert to fraction form
    86,119.20/128,498.40 = 74,455.20/x
  3. Step 3: Cross multiply
    86,119.20x = 128,498.40 × 74,455.20
  4. Step 4: Simplify right side
    86,119.20x = 9,567,374,071.68
  5. Step 5: Solve for x
    x = 9,567,374,071.68/86,119.20
  6. Step 6: Final answer
    x = 111,094.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.