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Finding the Fourth Proportional to 387,779.78, 581,676.96 and 121,534.40

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Solution

The fourth proportional to 387,779.78, 581,676.96 and 121,534.40 is: 182,303.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,779.78 : 581,676.96 = 121,534.40 : x
  2. Step 2: Convert to fraction form
    387,779.78/581,676.96 = 121,534.40/x
  3. Step 3: Cross multiply
    387,779.78x = 581,676.96 × 121,534.40
  4. Step 4: Simplify right side
    387,779.78x = 70,693,760,327.42
  5. Step 5: Solve for x
    x = 70,693,760,327.42/387,779.78
  6. Step 6: Final answer
    x = 182,303.88

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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.