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Finding the Fourth Proportional to 261,036.30, 390,679.65 and 261,036.30

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Solution

The fourth proportional to 261,036.30, 390,679.65 and 261,036.30 is: 390,679.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,036.30 : 390,679.65 = 261,036.30 : x
  2. Step 2: Convert to fraction form
    261,036.30/390,679.65 = 261,036.30/x
  3. Step 3: Cross multiply
    261,036.30x = 390,679.65 × 261,036.30
  4. Step 4: Simplify right side
    261,036.30x = 101,981,570,321.30
  5. Step 5: Solve for x
    x = 101,981,570,321.30/261,036.30
  6. Step 6: Final answer
    x = 390,679.65

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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.