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Finding the Fourth Proportional to 760.51, 1,139.95 and 543.43

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Solution

The fourth proportional to 760.51, 1,139.95 and 543.43 is: 814.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.51 : 1,139.95 = 543.43 : x
  2. Step 2: Convert to fraction form
    760.51/1,139.95 = 543.43/x
  3. Step 3: Cross multiply
    760.51x = 1,139.95 × 543.43
  4. Step 4: Simplify right side
    760.51x = 619,483.03
  5. Step 5: Solve for x
    x = 619,483.03/760.51
  6. Step 6: Final answer
    x = 814.56

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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.