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Finding the Fourth Proportional to 660,325.76, 990,357.60 and 323,221.76

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Solution

The fourth proportional to 660,325.76, 990,357.60 and 323,221.76 is: 484,768.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,325.76 : 990,357.60 = 323,221.76 : x
  2. Step 2: Convert to fraction form
    660,325.76/990,357.60 = 323,221.76/x
  3. Step 3: Cross multiply
    660,325.76x = 990,357.60 × 323,221.76
  4. Step 4: Simplify right side
    660,325.76x = 320,105,126,501.38
  5. Step 5: Solve for x
    x = 320,105,126,501.38/660,325.76
  6. Step 6: Final answer
    x = 484,768.50

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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.