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Finding the Fourth Proportional to 660,031.80, 990,047.70 and 621,324.60

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Solution

The fourth proportional to 660,031.80, 990,047.70 and 621,324.60 is: 931,986.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,031.80 : 990,047.70 = 621,324.60 : x
  2. Step 2: Convert to fraction form
    660,031.80/990,047.70 = 621,324.60/x
  3. Step 3: Cross multiply
    660,031.80x = 990,047.70 × 621,324.60
  4. Step 4: Simplify right side
    660,031.80x = 615,140,991,183.42
  5. Step 5: Solve for x
    x = 615,140,991,183.42/660,031.80
  6. Step 6: Final answer
    x = 931,986.90

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1.5x scale

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.