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Finding the Fourth Proportional to 740.40, 1,114.59 and 639.96

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Solution

The fourth proportional to 740.40, 1,114.59 and 639.96 is: 963.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.40 : 1,114.59 = 639.96 : x
  2. Step 2: Convert to fraction form
    740.40/1,114.59 = 639.96/x
  3. Step 3: Cross multiply
    740.40x = 1,114.59 × 639.96
  4. Step 4: Simplify right side
    740.40x = 713,293.02
  5. Step 5: Solve for x
    x = 713,293.02/740.40
  6. Step 6: Final answer
    x = 963.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.