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Finding the Fourth Proportional to 760.64, 1,139.60 and 543.12

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Solution

The fourth proportional to 760.64, 1,139.60 and 543.12 is: 813.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.64 : 1,139.60 = 543.12 : x
  2. Step 2: Convert to fraction form
    760.64/1,139.60 = 543.12/x
  3. Step 3: Cross multiply
    760.64x = 1,139.60 × 543.12
  4. Step 4: Simplify right side
    760.64x = 618,939.55
  5. Step 5: Solve for x
    x = 618,939.55/760.64
  6. Step 6: Final answer
    x = 813.71

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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.