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Finding the Fourth Proportional to 1,089.35, 1,502.81 and 669.66

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Solution

The fourth proportional to 1,089.35, 1,502.81 and 669.66 is: 923.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.35 : 1,502.81 = 669.66 : x
  2. Step 2: Convert to fraction form
    1,089.35/1,502.81 = 669.66/x
  3. Step 3: Cross multiply
    1,089.35x = 1,502.81 × 669.66
  4. Step 4: Simplify right side
    1,089.35x = 1,006,368.40
  5. Step 5: Solve for x
    x = 1,006,368.40/1,089.35
  6. Step 6: Final answer
    x = 923.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.