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Finding the Fourth Proportional to 528,009.90, 790,632.45 and 387,005.10

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Solution

The fourth proportional to 528,009.90, 790,632.45 and 387,005.10 is: 579,494.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,009.90 : 790,632.45 = 387,005.10 : x
  2. Step 2: Convert to fraction form
    528,009.90/790,632.45 = 387,005.10/x
  3. Step 3: Cross multiply
    528,009.90x = 790,632.45 × 387,005.10
  4. Step 4: Simplify right side
    528,009.90x = 305,978,790,375.50
  5. Step 5: Solve for x
    x = 305,978,790,375.50/528,009.90
  6. Step 6: Final answer
    x = 579,494.42

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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.