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Finding the Fourth Proportional to 710.19, 1,066.10 and 669.69

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Solution

The fourth proportional to 710.19, 1,066.10 and 669.69 is: 1,005.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.19 : 1,066.10 = 669.69 : x
  2. Step 2: Convert to fraction form
    710.19/1,066.10 = 669.69/x
  3. Step 3: Cross multiply
    710.19x = 1,066.10 × 669.69
  4. Step 4: Simplify right side
    710.19x = 713,956.51
  5. Step 5: Solve for x
    x = 713,956.51/710.19
  6. Step 6: Final answer
    x = 1,005.30

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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.