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Finding the Fourth Proportional to 528,021.40, 790,649.70 and 387,016.60

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Solution

The fourth proportional to 528,021.40, 790,649.70 and 387,016.60 is: 579,511.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,021.40 : 790,649.70 = 387,016.60 : x
  2. Step 2: Convert to fraction form
    528,021.40/790,649.70 = 387,016.60/x
  3. Step 3: Cross multiply
    528,021.40x = 790,649.70 × 387,016.60
  4. Step 4: Simplify right side
    528,021.40x = 305,994,558,685.02
  5. Step 5: Solve for x
    x = 305,994,558,685.02/528,021.40
  6. Step 6: Final answer
    x = 579,511.66

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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.