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Finding the Fourth Proportional to 660,357.20, 990,535.80 and 620,991.20

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Solution

The fourth proportional to 660,357.20, 990,535.80 and 620,991.20 is: 931,486.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,357.20 : 990,535.80 = 620,991.20 : x
  2. Step 2: Convert to fraction form
    660,357.20/990,535.80 = 620,991.20/x
  3. Step 3: Cross multiply
    660,357.20x = 990,535.80 × 620,991.20
  4. Step 4: Simplify right side
    660,357.20x = 615,114,015,084.96
  5. Step 5: Solve for x
    x = 615,114,015,084.96/660,357.20
  6. Step 6: Final answer
    x = 931,486.80

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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.