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Finding the Fourth Proportional to 760.56, 1,139.76 and 518.64

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Solution

The fourth proportional to 760.56, 1,139.76 and 518.64 is: 777.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.56 : 1,139.76 = 518.64 : x
  2. Step 2: Convert to fraction form
    760.56/1,139.76 = 518.64/x
  3. Step 3: Cross multiply
    760.56x = 1,139.76 × 518.64
  4. Step 4: Simplify right side
    760.56x = 591,125.13
  5. Step 5: Solve for x
    x = 591,125.13/760.56
  6. Step 6: Final answer
    x = 777.22

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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.