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Finding the Fourth Proportional to 612.08, 916.88 and 395.80

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Solution

The fourth proportional to 612.08, 916.88 and 395.80 is: 592.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.08 : 916.88 = 395.80 : x
  2. Step 2: Convert to fraction form
    612.08/916.88 = 395.80/x
  3. Step 3: Cross multiply
    612.08x = 916.88 × 395.80
  4. Step 4: Simplify right side
    612.08x = 362,901.10
  5. Step 5: Solve for x
    x = 362,901.10/612.08
  6. Step 6: Final answer
    x = 592.90

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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.