Home / 728,511,143.95-1,005,348,386.88-393,983,659.12

Finding the Fourth Proportional to 728,511,143.95, 1,005,348,386.88 and 393,983,659.12

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Solution

The fourth proportional to 728,511,143.95, 1,005,348,386.88 and 393,983,659.12 is: 543,699,076.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    728,511,143.95 : 1,005,348,386.88 = 393,983,659.12 : x
  2. Step 2: Convert to fraction form
    728,511,143.95/1,005,348,386.88 = 393,983,659.12/x
  3. Step 3: Cross multiply
    728,511,143.95x = 1,005,348,386.88 × 393,983,659.12
  4. Step 4: Simplify right side
    728,511,143.95x = 396,090,836,153,371,776
  5. Step 5: Solve for x
    x = 396,090,836,153,371,776/728,511,143.95
  6. Step 6: Final answer
    x = 543,699,076.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.