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Finding the Fourth Proportional to 985.09, 1,478.00 and 436.88

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Solution

The fourth proportional to 985.09, 1,478.00 and 436.88 is: 655.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.09 : 1,478.00 = 436.88 : x
  2. Step 2: Convert to fraction form
    985.09/1,478.00 = 436.88/x
  3. Step 3: Cross multiply
    985.09x = 1,478.00 × 436.88
  4. Step 4: Simplify right side
    985.09x = 645,706.46
  5. Step 5: Solve for x
    x = 645,706.46/985.09
  6. Step 6: Final answer
    x = 655.48

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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.