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Finding the Fourth Proportional to 258,956.80, 388,435.20 and 153,721.60

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Solution

The fourth proportional to 258,956.80, 388,435.20 and 153,721.60 is: 230,582.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,956.80 : 388,435.20 = 153,721.60 : x
  2. Step 2: Convert to fraction form
    258,956.80/388,435.20 = 153,721.60/x
  3. Step 3: Cross multiply
    258,956.80x = 388,435.20 × 153,721.60
  4. Step 4: Simplify right side
    258,956.80x = 59,710,880,440.32
  5. Step 5: Solve for x
    x = 59,710,880,440.32/258,956.80
  6. Step 6: Final answer
    x = 230,582.40

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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.