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Finding the Fourth Proportional to 934.53, 1,289.81 and 686.55

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Solution

The fourth proportional to 934.53, 1,289.81 and 686.55 is: 947.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.53 : 1,289.81 = 686.55 : x
  2. Step 2: Convert to fraction form
    934.53/1,289.81 = 686.55/x
  3. Step 3: Cross multiply
    934.53x = 1,289.81 × 686.55
  4. Step 4: Simplify right side
    934.53x = 885,515.62
  5. Step 5: Solve for x
    x = 885,515.62/934.53
  6. Step 6: Final answer
    x = 947.55

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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.