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Finding the Fourth Proportional to 611.46, 916.40 and 392.00

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Solution

The fourth proportional to 611.46, 916.40 and 392.00 is: 587.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.46 : 916.40 = 392.00 : x
  2. Step 2: Convert to fraction form
    611.46/916.40 = 392.00/x
  3. Step 3: Cross multiply
    611.46x = 916.40 × 392.00
  4. Step 4: Simplify right side
    611.46x = 359,222.26
  5. Step 5: Solve for x
    x = 359,222.26/611.46
  6. Step 6: Final answer
    x = 587.48

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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.