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Finding the Fourth Proportional to 660,620.80, 990,931.20 and 394,900.30

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Solution

The fourth proportional to 660,620.80, 990,931.20 and 394,900.30 is: 592,350.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,620.80 : 990,931.20 = 394,900.30 : x
  2. Step 2: Convert to fraction form
    660,620.80/990,931.20 = 394,900.30/x
  3. Step 3: Cross multiply
    660,620.80x = 990,931.20 × 394,900.30
  4. Step 4: Simplify right side
    660,620.80x = 391,319,028,159.36
  5. Step 5: Solve for x
    x = 391,319,028,159.36/660,620.80
  6. Step 6: Final answer
    x = 592,350.45

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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.