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Finding the Fourth Proportional to 916.75, 1,266.06 and 683.47

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Solution

The fourth proportional to 916.75, 1,266.06 and 683.47 is: 943.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.75 : 1,266.06 = 683.47 : x
  2. Step 2: Convert to fraction form
    916.75/1,266.06 = 683.47/x
  3. Step 3: Cross multiply
    916.75x = 1,266.06 × 683.47
  4. Step 4: Simplify right side
    916.75x = 865,314.03
  5. Step 5: Solve for x
    x = 865,314.03/916.75
  6. Step 6: Final answer
    x = 943.89

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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.