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Finding the Fourth Proportional to 946.90, 1,421.21 and 485.00

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Solution

The fourth proportional to 946.90, 1,421.21 and 485.00 is: 727.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.90 : 1,421.21 = 485.00 : x
  2. Step 2: Convert to fraction form
    946.90/1,421.21 = 485.00/x
  3. Step 3: Cross multiply
    946.90x = 1,421.21 × 485.00
  4. Step 4: Simplify right side
    946.90x = 689,277.32
  5. Step 5: Solve for x
    x = 689,277.32/946.90
  6. Step 6: Final answer
    x = 727.93

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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.