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Finding the Fourth Proportional to 718,120.86, 991,006.89 and 395,838

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Solution

The fourth proportional to 718,120.86, 991,006.89 and 395,838 is: 546,256.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,120.86 : 991,006.89 = 395,838 : x
  2. Step 2: Convert to fraction form
    718,120.86/991,006.89 = 395,838/x
  3. Step 3: Cross multiply
    718,120.86x = 991,006.89 × 395,838
  4. Step 4: Simplify right side
    718,120.86x = 392,278,185,323.82
  5. Step 5: Solve for x
    x = 392,278,185,323.82/718,120.86
  6. Step 6: Final answer
    x = 546,256.50

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1.5x scale

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.