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Finding the Fourth Proportional to 611.32, 916.30 and 391.25

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Solution

The fourth proportional to 611.32, 916.30 and 391.25 is: 586.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.32 : 916.30 = 391.25 : x
  2. Step 2: Convert to fraction form
    611.32/916.30 = 391.25/x
  3. Step 3: Cross multiply
    611.32x = 916.30 × 391.25
  4. Step 4: Simplify right side
    611.32x = 358,496.82
  5. Step 5: Solve for x
    x = 358,496.82/611.32
  6. Step 6: Final answer
    x = 586.43

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1.5x scale

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.