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Finding the Fourth Proportional to 718,139, 991,076.16 and 395,848.37

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Solution

The fourth proportional to 718,139, 991,076.16 and 395,848.37 is: 546,295.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,139 : 991,076.16 = 395,848.37 : x
  2. Step 2: Convert to fraction form
    718,139/991,076.16 = 395,848.37/x
  3. Step 3: Cross multiply
    718,139x = 991,076.16 × 395,848.37
  4. Step 4: Simplify right side
    718,139x = 392,315,882,481.86
  5. Step 5: Solve for x
    x = 392,315,882,481.86/718,139
  6. Step 6: Final answer
    x = 546,295.19

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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.