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Finding the Fourth Proportional to 740.16, 1,108.80 and 678.96

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Solution

The fourth proportional to 740.16, 1,108.80 and 678.96 is: 1,017.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.16 : 1,108.80 = 678.96 : x
  2. Step 2: Convert to fraction form
    740.16/1,108.80 = 678.96/x
  3. Step 3: Cross multiply
    740.16x = 1,108.80 × 678.96
  4. Step 4: Simplify right side
    740.16x = 752,830.85
  5. Step 5: Solve for x
    x = 752,830.85/740.16
  6. Step 6: Final answer
    x = 1,017.12

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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.