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Finding the Fourth Proportional to 323,987.90, 485,926.46 and 87,275.21

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Solution

The fourth proportional to 323,987.90, 485,926.46 and 87,275.21 is: 130,897.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,987.90 : 485,926.46 = 87,275.21 : x
  2. Step 2: Convert to fraction form
    323,987.90/485,926.46 = 87,275.21/x
  3. Step 3: Cross multiply
    323,987.90x = 485,926.46 × 87,275.21
  4. Step 4: Simplify right side
    323,987.90x = 42,409,334,619.50
  5. Step 5: Solve for x
    x = 42,409,334,619.50/323,987.90
  6. Step 6: Final answer
    x = 130,897.90

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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.