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Finding the Fourth Proportional to 258,517.56, 387,776.55 and 81,038.40

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Solution

The fourth proportional to 258,517.56, 387,776.55 and 81,038.40 is: 121,557.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,517.56 : 387,776.55 = 81,038.40 : x
  2. Step 2: Convert to fraction form
    258,517.56/387,776.55 = 81,038.40/x
  3. Step 3: Cross multiply
    258,517.56x = 387,776.55 × 81,038.40
  4. Step 4: Simplify right side
    258,517.56x = 31,424,791,169.52
  5. Step 5: Solve for x
    x = 31,424,791,169.52/258,517.56
  6. Step 6: Final answer
    x = 121,557.67

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1.5x scale

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.