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Finding the Fourth Proportional to 760.43, 1,138.82 and 434.81

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Solution

The fourth proportional to 760.43, 1,138.82 and 434.81 is: 651.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.43 : 1,138.82 = 434.81 : x
  2. Step 2: Convert to fraction form
    760.43/1,138.82 = 434.81/x
  3. Step 3: Cross multiply
    760.43x = 1,138.82 × 434.81
  4. Step 4: Simplify right side
    760.43x = 495,171.00
  5. Step 5: Solve for x
    x = 495,171.00/760.43
  6. Step 6: Final answer
    x = 651.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.