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Finding the Fourth Proportional to 388,402.56, 535,688.64 and 254,240.64

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Solution

The fourth proportional to 388,402.56, 535,688.64 and 254,240.64 is: 350,651.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,402.56 : 535,688.64 = 254,240.64 : x
  2. Step 2: Convert to fraction form
    388,402.56/535,688.64 = 254,240.64/x
  3. Step 3: Cross multiply
    388,402.56x = 535,688.64 × 254,240.64
  4. Step 4: Simplify right side
    388,402.56x = 136,193,822,674.33
  5. Step 5: Solve for x
    x = 136,193,822,674.33/388,402.56
  6. Step 6: Final answer
    x = 350,651.20

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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.