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Finding the Fourth Proportional to 387,779.28, 581,676.21 and 121,533.90

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Solution

The fourth proportional to 387,779.28, 581,676.21 and 121,533.90 is: 182,303.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,779.28 : 581,676.21 = 121,533.90 : x
  2. Step 2: Convert to fraction form
    387,779.28/581,676.21 = 121,533.90/x
  3. Step 3: Cross multiply
    387,779.28x = 581,676.21 × 121,533.90
  4. Step 4: Simplify right side
    387,779.28x = 70,693,378,338.52
  5. Step 5: Solve for x
    x = 70,693,378,338.52/387,779.28
  6. Step 6: Final answer
    x = 182,303.13

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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.