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Finding the Fourth Proportional to 400,912, 601,403.52 and 105,424

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Solution

The fourth proportional to 400,912, 601,403.52 and 105,424 is: 158,145.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    400,912 : 601,403.52 = 105,424 : x
  2. Step 2: Convert to fraction form
    400,912/601,403.52 = 105,424/x
  3. Step 3: Cross multiply
    400,912x = 601,403.52 × 105,424
  4. Step 4: Simplify right side
    400,912x = 63,402,364,692.48
  5. Step 5: Solve for x
    x = 63,402,364,692.48/400,912
  6. Step 6: Final answer
    x = 158,145.34

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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.