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Finding the Fourth Proportional to 613,005.68, 918,312.96 and 345,958.40

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Solution

The fourth proportional to 613,005.68, 918,312.96 and 345,958.40 is: 518,262.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,005.68 : 918,312.96 = 345,958.40 : x
  2. Step 2: Convert to fraction form
    613,005.68/918,312.96 = 345,958.40/x
  3. Step 3: Cross multiply
    613,005.68x = 918,312.96 × 345,958.40
  4. Step 4: Simplify right side
    613,005.68x = 317,698,082,340.86
  5. Step 5: Solve for x
    x = 317,698,082,340.86/613,005.68
  6. Step 6: Final answer
    x = 518,262.87

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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.