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Finding the Fourth Proportional to 261,311.76, 392,042.16 and 128,230.38

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Solution

The fourth proportional to 261,311.76, 392,042.16 and 128,230.38 is: 192,382.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,311.76 : 392,042.16 = 128,230.38 : x
  2. Step 2: Convert to fraction form
    261,311.76/392,042.16 = 128,230.38/x
  3. Step 3: Cross multiply
    261,311.76x = 392,042.16 × 128,230.38
  4. Step 4: Simplify right side
    261,311.76x = 50,271,715,152.82
  5. Step 5: Solve for x
    x = 50,271,715,152.82/261,311.76
  6. Step 6: Final answer
    x = 192,382.14

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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.