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Finding the Fourth Proportional to 954.30, 1,431.59 and 485.94

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Solution

The fourth proportional to 954.30, 1,431.59 and 485.94 is: 728.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.30 : 1,431.59 = 485.94 : x
  2. Step 2: Convert to fraction form
    954.30/1,431.59 = 485.94/x
  3. Step 3: Cross multiply
    954.30x = 1,431.59 × 485.94
  4. Step 4: Simplify right side
    954.30x = 695,664.41
  5. Step 5: Solve for x
    x = 695,664.41/954.30
  6. Step 6: Final answer
    x = 728.98

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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.