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Finding the Fourth Proportional to 611,603.40, 917,077.05 and 256,215.90

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Solution

The fourth proportional to 611,603.40, 917,077.05 and 256,215.90 is: 384,186.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,603.40 : 917,077.05 = 256,215.90 : x
  2. Step 2: Convert to fraction form
    611,603.40/917,077.05 = 256,215.90/x
  3. Step 3: Cross multiply
    611,603.40x = 917,077.05 × 256,215.90
  4. Step 4: Simplify right side
    611,603.40x = 234,969,721,735.10
  5. Step 5: Solve for x
    x = 234,969,721,735.10/611,603.40
  6. Step 6: Final answer
    x = 384,186.42

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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.