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Finding the Fourth Proportional to 995.40, 1,492.86 and 417.72

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Solution

The fourth proportional to 995.40, 1,492.86 and 417.72 is: 626.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.40 : 1,492.86 = 417.72 : x
  2. Step 2: Convert to fraction form
    995.40/1,492.86 = 417.72/x
  3. Step 3: Cross multiply
    995.40x = 1,492.86 × 417.72
  4. Step 4: Simplify right side
    995.40x = 623,597.48
  5. Step 5: Solve for x
    x = 623,597.48/995.40
  6. Step 6: Final answer
    x = 626.48

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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.