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Finding the Fourth Proportional to 553,067.69, 763,306.16 and 311,397.36

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Solution

The fourth proportional to 553,067.69, 763,306.16 and 311,397.36 is: 429,769.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,067.69 : 763,306.16 = 311,397.36 : x
  2. Step 2: Convert to fraction form
    553,067.69/763,306.16 = 311,397.36/x
  3. Step 3: Cross multiply
    553,067.69x = 763,306.16 × 311,397.36
  4. Step 4: Simplify right side
    553,067.69x = 237,691,521,538.75
  5. Step 5: Solve for x
    x = 237,691,521,538.75/553,067.69
  6. Step 6: Final answer
    x = 429,769.32

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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.