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Finding the Fourth Proportional to 761.12, 1,139.12 and 436

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Solution

The fourth proportional to 761.12, 1,139.12 and 436 is: 652.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.12 : 1,139.12 = 436 : x
  2. Step 2: Convert to fraction form
    761.12/1,139.12 = 436/x
  3. Step 3: Cross multiply
    761.12x = 1,139.12 × 436
  4. Step 4: Simplify right side
    761.12x = 496,656.32
  5. Step 5: Solve for x
    x = 496,656.32/761.12
  6. Step 6: Final answer
    x = 652.53

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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.