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Finding the Fourth Proportional to 761.16, 1,139.10 and 657.96

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Solution

The fourth proportional to 761.16, 1,139.10 and 657.96 is: 984.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.16 : 1,139.10 = 657.96 : x
  2. Step 2: Convert to fraction form
    761.16/1,139.10 = 657.96/x
  3. Step 3: Cross multiply
    761.16x = 1,139.10 × 657.96
  4. Step 4: Simplify right side
    761.16x = 749,482.24
  5. Step 5: Solve for x
    x = 749,482.24/761.16
  6. Step 6: Final answer
    x = 984.66

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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.