Home / 387,099,809.60-580,637,272.80-128,326,971.20

Finding the Fourth Proportional to 387,099,809.60, 580,637,272.80 and 128,326,971.20

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Solution

The fourth proportional to 387,099,809.60, 580,637,272.80 and 128,326,971.20 is: 192,486,332.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,099,809.60 : 580,637,272.80 = 128,326,971.20 : x
  2. Step 2: Convert to fraction form
    387,099,809.60/580,637,272.80 = 128,326,971.20/x
  3. Step 3: Cross multiply
    387,099,809.60x = 580,637,272.80 × 128,326,971.20
  4. Step 4: Simplify right side
    387,099,809.60x = 74,511,422,584,252,144
  5. Step 5: Solve for x
    x = 74,511,422,584,252,144/387,099,809.60
  6. Step 6: Final answer
    x = 192,486,332.30

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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.