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Finding the Fourth Proportional to 258,621, 387,931.59 and 81,141.90

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Solution

The fourth proportional to 258,621, 387,931.59 and 81,141.90 is: 121,712.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,621 : 387,931.59 = 81,141.90 : x
  2. Step 2: Convert to fraction form
    258,621/387,931.59 = 81,141.90/x
  3. Step 3: Cross multiply
    258,621x = 387,931.59 × 81,141.90
  4. Step 4: Simplify right side
    258,621x = 31,477,506,282.62
  5. Step 5: Solve for x
    x = 31,477,506,282.62/258,621
  6. Step 6: Final answer
    x = 121,712.88

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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.