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Finding the Fourth Proportional to 258,528.80, 387,663.60 and 118,128.80

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Solution

The fourth proportional to 258,528.80, 387,663.60 and 118,128.80 is: 177,133.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,528.80 : 387,663.60 = 118,128.80 : x
  2. Step 2: Convert to fraction form
    258,528.80/387,663.60 = 118,128.80/x
  3. Step 3: Cross multiply
    258,528.80x = 387,663.60 × 118,128.80
  4. Step 4: Simplify right side
    258,528.80x = 45,794,235,871.68
  5. Step 5: Solve for x
    x = 45,794,235,871.68/258,528.80
  6. Step 6: Final answer
    x = 177,133.98

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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.