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Finding the Fourth Proportional to 388,000.80, 535,265.12 and 280,400.40

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Solution

The fourth proportional to 388,000.80, 535,265.12 and 280,400.40 is: 386,825.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,000.80 : 535,265.12 = 280,400.40 : x
  2. Step 2: Convert to fraction form
    388,000.80/535,265.12 = 280,400.40/x
  3. Step 3: Cross multiply
    388,000.80x = 535,265.12 × 280,400.40
  4. Step 4: Simplify right side
    388,000.80x = 150,088,553,754.05
  5. Step 5: Solve for x
    x = 150,088,553,754.05/388,000.80
  6. Step 6: Final answer
    x = 386,825.37

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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.