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Finding the Fourth Proportional to 1,039.35, 1,434.05 and 646.09

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Solution

The fourth proportional to 1,039.35, 1,434.05 and 646.09 is: 891.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.35 : 1,434.05 = 646.09 : x
  2. Step 2: Convert to fraction form
    1,039.35/1,434.05 = 646.09/x
  3. Step 3: Cross multiply
    1,039.35x = 1,434.05 × 646.09
  4. Step 4: Simplify right side
    1,039.35x = 926,522.13
  5. Step 5: Solve for x
    x = 926,522.13/1,039.35
  6. Step 6: Final answer
    x = 891.45

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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.