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Finding the Fourth Proportional to 261,427.80, 392,400.90 and 128,458.20

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Solution

The fourth proportional to 261,427.80, 392,400.90 and 128,458.20 is: 192,814.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,427.80 : 392,400.90 = 128,458.20 : x
  2. Step 2: Convert to fraction form
    261,427.80/392,400.90 = 128,458.20/x
  3. Step 3: Cross multiply
    261,427.80x = 392,400.90 × 128,458.20
  4. Step 4: Simplify right side
    261,427.80x = 50,407,113,292.38
  5. Step 5: Solve for x
    x = 50,407,113,292.38/261,427.80
  6. Step 6: Final answer
    x = 192,814.66

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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.