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Finding the Fourth Proportional to 261,431.80, 392,406.90 and 128,462.20

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Solution

The fourth proportional to 261,431.80, 392,406.90 and 128,462.20 is: 192,820.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,431.80 : 392,406.90 = 128,462.20 : x
  2. Step 2: Convert to fraction form
    261,431.80/392,406.90 = 128,462.20/x
  3. Step 3: Cross multiply
    261,431.80x = 392,406.90 × 128,462.20
  4. Step 4: Simplify right side
    261,431.80x = 50,409,453,669.18
  5. Step 5: Solve for x
    x = 50,409,453,669.18/261,431.80
  6. Step 6: Final answer
    x = 192,820.67

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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.