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Finding the Fourth Proportional to 660,212.10, 990,646.20 and 260,865.90

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Solution

The fourth proportional to 660,212.10, 990,646.20 and 260,865.90 is: 391,428.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,212.10 : 990,646.20 = 260,865.90 : x
  2. Step 2: Convert to fraction form
    660,212.10/990,646.20 = 260,865.90/x
  3. Step 3: Cross multiply
    660,212.10x = 990,646.20 × 260,865.90
  4. Step 4: Simplify right side
    660,212.10x = 258,425,812,544.58
  5. Step 5: Solve for x
    x = 258,425,812,544.58/660,212.10
  6. Step 6: Final answer
    x = 391,428.47

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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.