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Finding the Fourth Proportional to 553,139.40, 763,346.82 and 311,430.84

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Solution

The fourth proportional to 553,139.40, 763,346.82 and 311,430.84 is: 429,782.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,139.40 : 763,346.82 = 311,430.84 : x
  2. Step 2: Convert to fraction form
    553,139.40/763,346.82 = 311,430.84/x
  3. Step 3: Cross multiply
    553,139.40x = 763,346.82 × 311,430.84
  4. Step 4: Simplify right side
    553,139.40x = 237,729,741,363.93
  5. Step 5: Solve for x
    x = 237,729,741,363.93/553,139.40
  6. Step 6: Final answer
    x = 429,782.69

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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.