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Finding the Fourth Proportional to 620,412.55, 855,951.27 and 405,678.31

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Solution

The fourth proportional to 620,412.55, 855,951.27 and 405,678.31 is: 559,693.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,412.55 : 855,951.27 = 405,678.31 : x
  2. Step 2: Convert to fraction form
    620,412.55/855,951.27 = 405,678.31/x
  3. Step 3: Cross multiply
    620,412.55x = 855,951.27 × 405,678.31
  4. Step 4: Simplify right side
    620,412.55x = 347,240,864,655.95
  5. Step 5: Solve for x
    x = 347,240,864,655.95/620,412.55
  6. Step 6: Final answer
    x = 559,693.49

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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.