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Finding the Fourth Proportional to 385,615.68, 578,501.64 and 136,472.64

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Solution

The fourth proportional to 385,615.68, 578,501.64 and 136,472.64 is: 204,736.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,615.68 : 578,501.64 = 136,472.64 : x
  2. Step 2: Convert to fraction form
    385,615.68/578,501.64 = 136,472.64/x
  3. Step 3: Cross multiply
    385,615.68x = 578,501.64 × 136,472.64
  4. Step 4: Simplify right side
    385,615.68x = 78,949,646,055.13
  5. Step 5: Solve for x
    x = 78,949,646,055.13/385,615.68
  6. Step 6: Final answer
    x = 204,736.61

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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.