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Finding the Fourth Proportional to 553,073.74, 763,256.53 and 311,365.49

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Solution

The fourth proportional to 553,073.74, 763,256.53 and 311,365.49 is: 429,692.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,073.74 : 763,256.53 = 311,365.49 : x
  2. Step 2: Convert to fraction form
    553,073.74/763,256.53 = 311,365.49/x
  3. Step 3: Cross multiply
    553,073.74x = 763,256.53 × 311,365.49
  4. Step 4: Simplify right side
    553,073.74x = 237,651,738,864.45
  5. Step 5: Solve for x
    x = 237,651,738,864.45/553,073.74
  6. Step 6: Final answer
    x = 429,692.68

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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.