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Finding the Fourth Proportional to 386,804.72, 580,437.12 and 209,308.16

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Solution

The fourth proportional to 386,804.72, 580,437.12 and 209,308.16 is: 314,086.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,804.72 : 580,437.12 = 209,308.16 : x
  2. Step 2: Convert to fraction form
    386,804.72/580,437.12 = 209,308.16/x
  3. Step 3: Cross multiply
    386,804.72x = 580,437.12 × 209,308.16
  4. Step 4: Simplify right side
    386,804.72x = 121,490,225,582.90
  5. Step 5: Solve for x
    x = 121,490,225,582.90/386,804.72
  6. Step 6: Final answer
    x = 314,086.72

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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.