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Finding the Fourth Proportional to 387,657.72, 581,486.12 and 121,438.97

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Solution

The fourth proportional to 387,657.72, 581,486.12 and 121,438.97 is: 182,158.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,657.72 : 581,486.12 = 121,438.97 : x
  2. Step 2: Convert to fraction form
    387,657.72/581,486.12 = 121,438.97/x
  3. Step 3: Cross multiply
    387,657.72x = 581,486.12 × 121,438.97
  4. Step 4: Simplify right side
    387,657.72x = 70,615,072,271.07
  5. Step 5: Solve for x
    x = 70,615,072,271.07/387,657.72
  6. Step 6: Final answer
    x = 182,158.30

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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.