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Finding the Fourth Proportional to 261,628.60, 392,442.90 and 259,660.30

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Solution

The fourth proportional to 261,628.60, 392,442.90 and 259,660.30 is: 389,490.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,628.60 : 392,442.90 = 259,660.30 : x
  2. Step 2: Convert to fraction form
    261,628.60/392,442.90 = 259,660.30/x
  3. Step 3: Cross multiply
    261,628.60x = 392,442.90 × 259,660.30
  4. Step 4: Simplify right side
    261,628.60x = 101,901,841,146.87
  5. Step 5: Solve for x
    x = 101,901,841,146.87/261,628.60
  6. Step 6: Final answer
    x = 389,490.45

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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.