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Finding the Fourth Proportional to 388,087.74, 535,384.08 and 280,487.34

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Solution

The fourth proportional to 388,087.74, 535,384.08 and 280,487.34 is: 386,944.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,087.74 : 535,384.08 = 280,487.34 : x
  2. Step 2: Convert to fraction form
    388,087.74/535,384.08 = 280,487.34/x
  3. Step 3: Cross multiply
    388,087.74x = 535,384.08 × 280,487.34
  4. Step 4: Simplify right side
    388,087.74x = 150,168,456,477.55
  5. Step 5: Solve for x
    x = 150,168,456,477.55/388,087.74
  6. Step 6: Final answer
    x = 386,944.60

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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.