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Finding the Fourth Proportional to 611,429.60, 917,144.40 and 387,480.80

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Solution

The fourth proportional to 611,429.60, 917,144.40 and 387,480.80 is: 581,221.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,429.60 : 917,144.40 = 387,480.80 : x
  2. Step 2: Convert to fraction form
    611,429.60/917,144.40 = 387,480.80/x
  3. Step 3: Cross multiply
    611,429.60x = 917,144.40 × 387,480.80
  4. Step 4: Simplify right side
    611,429.60x = 355,375,845,827.52
  5. Step 5: Solve for x
    x = 355,375,845,827.52/611,429.60
  6. Step 6: Final answer
    x = 581,221.20

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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.