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Finding the Fourth Proportional to 478,995.96, 661,030.39 and 261,216.55

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Solution

The fourth proportional to 478,995.96, 661,030.39 and 261,216.55 is: 360,487.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,995.96 : 661,030.39 = 261,216.55 : x
  2. Step 2: Convert to fraction form
    478,995.96/661,030.39 = 261,216.55/x
  3. Step 3: Cross multiply
    478,995.96x = 661,030.39 × 261,216.55
  4. Step 4: Simplify right side
    478,995.96x = 172,672,077,920.96
  5. Step 5: Solve for x
    x = 172,672,077,920.96/478,995.96
  6. Step 6: Final answer
    x = 360,487.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.