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Finding the Fourth Proportional to 528,079.50, 728,795.79 and 289,661.58

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Solution

The fourth proportional to 528,079.50, 728,795.79 and 289,661.58 is: 399,758.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,079.50 : 728,795.79 = 289,661.58 : x
  2. Step 2: Convert to fraction form
    528,079.50/728,795.79 = 289,661.58/x
  3. Step 3: Cross multiply
    528,079.50x = 728,795.79 × 289,661.58
  4. Step 4: Simplify right side
    528,079.50x = 211,104,140,028.75
  5. Step 5: Solve for x
    x = 211,104,140,028.75/528,079.50
  6. Step 6: Final answer
    x = 399,758.26

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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.