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Finding the Fourth Proportional to 918,687.84, 1,268,143.80 and 612,653.64

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Solution

The fourth proportional to 918,687.84, 1,268,143.80 and 612,653.64 is: 845,698.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,687.84 : 1,268,143.80 = 612,653.64 : x
  2. Step 2: Convert to fraction form
    918,687.84/1,268,143.80 = 612,653.64/x
  3. Step 3: Cross multiply
    918,687.84x = 1,268,143.80 × 612,653.64
  4. Step 4: Simplify right side
    918,687.84x = 776,932,915,113.43
  5. Step 5: Solve for x
    x = 776,932,915,113.43/918,687.84
  6. Step 6: Final answer
    x = 845,698.49

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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.