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Finding the Fourth Proportional to 992,990.80, 1,490,101.80 and 520,015.60

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Solution

The fourth proportional to 992,990.80, 1,490,101.80 and 520,015.60 is: 780,345.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    992,990.80 : 1,490,101.80 = 520,015.60 : x
  2. Step 2: Convert to fraction form
    992,990.80/1,490,101.80 = 520,015.60/x
  3. Step 3: Cross multiply
    992,990.80x = 1,490,101.80 × 520,015.60
  4. Step 4: Simplify right side
    992,990.80x = 774,876,181,588.08
  5. Step 5: Solve for x
    x = 774,876,181,588.08/992,990.80
  6. Step 6: Final answer
    x = 780,345.78

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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.