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Finding the Fourth Proportional to 86,685.48, 130,021.74 and 31,281.48

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Solution

The fourth proportional to 86,685.48, 130,021.74 and 31,281.48 is: 46,919.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,685.48 : 130,021.74 = 31,281.48 : x
  2. Step 2: Convert to fraction form
    86,685.48/130,021.74 = 31,281.48/x
  3. Step 3: Cross multiply
    86,685.48x = 130,021.74 × 31,281.48
  4. Step 4: Simplify right side
    86,685.48x = 4,067,272,459.38
  5. Step 5: Solve for x
    x = 4,067,272,459.38/86,685.48
  6. Step 6: Final answer
    x = 46,919.88

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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.