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Finding the Fourth Proportional to 760.70, 1,140.72 and 394.70

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Solution

The fourth proportional to 760.70, 1,140.72 and 394.70 is: 591.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.70 : 1,140.72 = 394.70 : x
  2. Step 2: Convert to fraction form
    760.70/1,140.72 = 394.70/x
  3. Step 3: Cross multiply
    760.70x = 1,140.72 × 394.70
  4. Step 4: Simplify right side
    760.70x = 450,242.18
  5. Step 5: Solve for x
    x = 450,242.18/760.70
  6. Step 6: Final answer
    x = 591.88

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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.