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Finding the Fourth Proportional to 258,140.04, 387,180.90 and 89,630.88

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Solution

The fourth proportional to 258,140.04, 387,180.90 and 89,630.88 is: 134,436.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,140.04 : 387,180.90 = 89,630.88 : x
  2. Step 2: Convert to fraction form
    258,140.04/387,180.90 = 89,630.88/x
  3. Step 3: Cross multiply
    258,140.04x = 387,180.90 × 89,630.88
  4. Step 4: Simplify right side
    258,140.04x = 34,703,364,786.19
  5. Step 5: Solve for x
    x = 34,703,364,786.19/258,140.04
  6. Step 6: Final answer
    x = 134,436.20

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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.