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Finding the Fourth Proportional to 613,674.72, 920,637.60 and 258,688.80

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Solution

The fourth proportional to 613,674.72, 920,637.60 and 258,688.80 is: 388,086.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,674.72 : 920,637.60 = 258,688.80 : x
  2. Step 2: Convert to fraction form
    613,674.72/920,637.60 = 258,688.80/x
  3. Step 3: Cross multiply
    613,674.72x = 920,637.60 × 258,688.80
  4. Step 4: Simplify right side
    613,674.72x = 238,158,635,978.88
  5. Step 5: Solve for x
    x = 238,158,635,978.88/613,674.72
  6. Step 6: Final answer
    x = 388,086.11

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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.