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Finding the Fourth Proportional to 405,120.40, 607,680.60 and 124,637.20

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Solution

The fourth proportional to 405,120.40, 607,680.60 and 124,637.20 is: 186,955.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,120.40 : 607,680.60 = 124,637.20 : x
  2. Step 2: Convert to fraction form
    405,120.40/607,680.60 = 124,637.20/x
  3. Step 3: Cross multiply
    405,120.40x = 607,680.60 × 124,637.20
  4. Step 4: Simplify right side
    405,120.40x = 75,739,608,478.32
  5. Step 5: Solve for x
    x = 75,739,608,478.32/405,120.40
  6. Step 6: Final answer
    x = 186,955.80

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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.