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Finding the Fourth Proportional to 553,090.29, 763,278.83 and 311,381.45

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Solution

The fourth proportional to 553,090.29, 763,278.83 and 311,381.45 is: 429,714.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,090.29 : 763,278.83 = 311,381.45 : x
  2. Step 2: Convert to fraction form
    553,090.29/763,278.83 = 311,381.45/x
  3. Step 3: Cross multiply
    553,090.29x = 763,278.83 × 311,381.45
  4. Step 4: Simplify right side
    553,090.29x = 237,670,868,839.70
  5. Step 5: Solve for x
    x = 237,670,868,839.70/553,090.29
  6. Step 6: Final answer
    x = 429,714.41

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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.