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Finding the Fourth Proportional to 423,918.40, 635,683.20 and 187,139.20

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Solution

The fourth proportional to 423,918.40, 635,683.20 and 187,139.20 is: 280,622.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,918.40 : 635,683.20 = 187,139.20 : x
  2. Step 2: Convert to fraction form
    423,918.40/635,683.20 = 187,139.20/x
  3. Step 3: Cross multiply
    423,918.40x = 635,683.20 × 187,139.20
  4. Step 4: Simplify right side
    423,918.40x = 118,961,245,501.44
  5. Step 5: Solve for x
    x = 118,961,245,501.44/423,918.40
  6. Step 6: Final answer
    x = 280,622.98

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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.