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Finding the Fourth Proportional to 710.75, 1,066.07 and 438.51

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Solution

The fourth proportional to 710.75, 1,066.07 and 438.51 is: 657.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.75 : 1,066.07 = 438.51 : x
  2. Step 2: Convert to fraction form
    710.75/1,066.07 = 438.51/x
  3. Step 3: Cross multiply
    710.75x = 1,066.07 × 438.51
  4. Step 4: Simplify right side
    710.75x = 467,482.36
  5. Step 5: Solve for x
    x = 467,482.36/710.75
  6. Step 6: Final answer
    x = 657.73

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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.