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Finding the Fourth Proportional to 403,386.30, 605,079.45 and 261,668.70

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Solution

The fourth proportional to 403,386.30, 605,079.45 and 261,668.70 is: 392,503.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,386.30 : 605,079.45 = 261,668.70 : x
  2. Step 2: Convert to fraction form
    403,386.30/605,079.45 = 261,668.70/x
  3. Step 3: Cross multiply
    403,386.30x = 605,079.45 × 261,668.70
  4. Step 4: Simplify right side
    403,386.30x = 158,330,353,078.22
  5. Step 5: Solve for x
    x = 158,330,353,078.22/403,386.30
  6. Step 6: Final answer
    x = 392,503.05

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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.