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Finding the Fourth Proportional to 660,564.33, 911,580.54 and 388,642.47

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Solution

The fourth proportional to 660,564.33, 911,580.54 and 388,642.47 is: 536,327.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,564.33 : 911,580.54 = 388,642.47 : x
  2. Step 2: Convert to fraction form
    660,564.33/911,580.54 = 388,642.47/x
  3. Step 3: Cross multiply
    660,564.33x = 911,580.54 × 388,642.47
  4. Step 4: Simplify right side
    660,564.33x = 354,278,912,669.53
  5. Step 5: Solve for x
    x = 354,278,912,669.53/660,564.33
  6. Step 6: Final answer
    x = 536,327.65

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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.