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Finding the Fourth Proportional to 387,289.69, 534,509.89 and 217,523.81

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Solution

The fourth proportional to 387,289.69, 534,509.89 and 217,523.81 is: 300,211.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,289.69 : 534,509.89 = 217,523.81 : x
  2. Step 2: Convert to fraction form
    387,289.69/534,509.89 = 217,523.81/x
  3. Step 3: Cross multiply
    387,289.69x = 534,509.89 × 217,523.81
  4. Step 4: Simplify right side
    387,289.69x = 116,268,628,547.95
  5. Step 5: Solve for x
    x = 116,268,628,547.95/387,289.69
  6. Step 6: Final answer
    x = 300,211.01

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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.