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Finding the Fourth Proportional to 761.49, 1,050.75 and 429.90

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Solution

The fourth proportional to 761.49, 1,050.75 and 429.90 is: 593.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.49 : 1,050.75 = 429.90 : x
  2. Step 2: Convert to fraction form
    761.49/1,050.75 = 429.90/x
  3. Step 3: Cross multiply
    761.49x = 1,050.75 × 429.90
  4. Step 4: Simplify right side
    761.49x = 451,717.43
  5. Step 5: Solve for x
    x = 451,717.43/761.49
  6. Step 6: Final answer
    x = 593.20

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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.