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Finding the Fourth Proportional to 387,585.55, 581,378.34 and 121,366.90

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Solution

The fourth proportional to 387,585.55, 581,378.34 and 121,366.90 is: 182,050.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,585.55 : 581,378.34 = 121,366.90 : x
  2. Step 2: Convert to fraction form
    387,585.55/581,378.34 = 121,366.90/x
  3. Step 3: Cross multiply
    387,585.55x = 581,378.34 × 121,366.90
  4. Step 4: Simplify right side
    387,585.55x = 70,560,086,852.95
  5. Step 5: Solve for x
    x = 70,560,086,852.95/387,585.55
  6. Step 6: Final answer
    x = 182,050.35

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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.