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Finding the Fourth Proportional to 660,438.60, 990,001.80 and 323,203.20

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Solution

The fourth proportional to 660,438.60, 990,001.80 and 323,203.20 is: 484,483.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,438.60 : 990,001.80 = 323,203.20 : x
  2. Step 2: Convert to fraction form
    660,438.60/990,001.80 = 323,203.20/x
  3. Step 3: Cross multiply
    660,438.60x = 990,001.80 × 323,203.20
  4. Step 4: Simplify right side
    660,438.60x = 319,971,749,765.76
  5. Step 5: Solve for x
    x = 319,971,749,765.76/660,438.60
  6. Step 6: Final answer
    x = 484,483.72

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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.