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Finding the Fourth Proportional to 553,062.05, 763,298.38 and 311,391.72

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Solution

The fourth proportional to 553,062.05, 763,298.38 and 311,391.72 is: 429,761.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,062.05 : 763,298.38 = 311,391.72 : x
  2. Step 2: Convert to fraction form
    553,062.05/763,298.38 = 311,391.72/x
  3. Step 3: Cross multiply
    553,062.05x = 763,298.38 × 311,391.72
  4. Step 4: Simplify right side
    553,062.05x = 237,684,794,642.93
  5. Step 5: Solve for x
    x = 237,684,794,642.93/553,062.05
  6. Step 6: Final answer
    x = 429,761.53

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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.