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Finding the Fourth Proportional to 660,374.60, 990,561.90 and 621,008.60

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Solution

The fourth proportional to 660,374.60, 990,561.90 and 621,008.60 is: 931,512.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,374.60 : 990,561.90 = 621,008.60 : x
  2. Step 2: Convert to fraction form
    660,374.60/990,561.90 = 621,008.60/x
  3. Step 3: Cross multiply
    660,374.60x = 990,561.90 × 621,008.60
  4. Step 4: Simplify right side
    660,374.60x = 615,147,458,732.34
  5. Step 5: Solve for x
    x = 615,147,458,732.34/660,374.60
  6. Step 6: Final answer
    x = 931,512.90

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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.