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Finding the Fourth Proportional to 521,911.80, 720,226.08 and 307,065.69

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Solution

The fourth proportional to 521,911.80, 720,226.08 and 307,065.69 is: 423,743.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,911.80 : 720,226.08 = 307,065.69 : x
  2. Step 2: Convert to fraction form
    521,911.80/720,226.08 = 307,065.69/x
  3. Step 3: Cross multiply
    521,911.80x = 720,226.08 × 307,065.69
  4. Step 4: Simplify right side
    521,911.80x = 221,156,718,211.20
  5. Step 5: Solve for x
    x = 221,156,718,211.20/521,911.80
  6. Step 6: Final answer
    x = 423,743.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.