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Finding the Fourth Proportional to 985.55, 1,475.81 and 956.36

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Solution

The fourth proportional to 985.55, 1,475.81 and 956.36 is: 1,432.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.55 : 1,475.81 = 956.36 : x
  2. Step 2: Convert to fraction form
    985.55/1,475.81 = 956.36/x
  3. Step 3: Cross multiply
    985.55x = 1,475.81 × 956.36
  4. Step 4: Simplify right side
    985.55x = 1,411,398.50
  5. Step 5: Solve for x
    x = 1,411,398.50/985.55
  6. Step 6: Final answer
    x = 1,432.09

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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.