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Finding the Fourth Proportional to 258,311.70, 387,309.06 and 100,355.76

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Solution

The fourth proportional to 258,311.70, 387,309.06 and 100,355.76 is: 150,472.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,311.70 : 387,309.06 = 100,355.76 : x
  2. Step 2: Convert to fraction form
    258,311.70/387,309.06 = 100,355.76/x
  3. Step 3: Cross multiply
    258,311.70x = 387,309.06 × 100,355.76
  4. Step 4: Simplify right side
    258,311.70x = 38,868,695,071.19
  5. Step 5: Solve for x
    x = 38,868,695,071.19/258,311.70
  6. Step 6: Final answer
    x = 150,472.07

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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.