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Finding the Fourth Proportional to 760.17, 1,140.43 and 315.46

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Solution

The fourth proportional to 760.17, 1,140.43 and 315.46 is: 473.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.17 : 1,140.43 = 315.46 : x
  2. Step 2: Convert to fraction form
    760.17/1,140.43 = 315.46/x
  3. Step 3: Cross multiply
    760.17x = 1,140.43 × 315.46
  4. Step 4: Simplify right side
    760.17x = 359,760.05
  5. Step 5: Solve for x
    x = 359,760.05/760.17
  6. Step 6: Final answer
    x = 473.26

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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.