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Finding the Fourth Proportional to 521,899.70, 720,209.39 and 307,053.60

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Solution

The fourth proportional to 521,899.70, 720,209.39 and 307,053.60 is: 423,726.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,899.70 : 720,209.39 = 307,053.60 : x
  2. Step 2: Convert to fraction form
    521,899.70/720,209.39 = 307,053.60/x
  3. Step 3: Cross multiply
    521,899.70x = 720,209.39 × 307,053.60
  4. Step 4: Simplify right side
    521,899.70x = 221,142,885,953.30
  5. Step 5: Solve for x
    x = 221,142,885,953.30/521,899.70
  6. Step 6: Final answer
    x = 423,726.79

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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.