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Finding the Fourth Proportional to 413,095.40, 619,643.10 and 388,212.20

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Solution

The fourth proportional to 413,095.40, 619,643.10 and 388,212.20 is: 582,318.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    413,095.40 : 619,643.10 = 388,212.20 : x
  2. Step 2: Convert to fraction form
    413,095.40/619,643.10 = 388,212.20/x
  3. Step 3: Cross multiply
    413,095.40x = 619,643.10 × 388,212.20
  4. Step 4: Simplify right side
    413,095.40x = 240,553,011,065.82
  5. Step 5: Solve for x
    x = 240,553,011,065.82/413,095.40
  6. Step 6: Final answer
    x = 582,318.30

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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.