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Finding the Fourth Proportional to 948.01, 1,421.33 and 639.10

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Solution

The fourth proportional to 948.01, 1,421.33 and 639.10 is: 958.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.01 : 1,421.33 = 639.10 : x
  2. Step 2: Convert to fraction form
    948.01/1,421.33 = 639.10/x
  3. Step 3: Cross multiply
    948.01x = 1,421.33 × 639.10
  4. Step 4: Simplify right side
    948.01x = 908,366.18
  5. Step 5: Solve for x
    x = 908,366.18/948.01
  6. Step 6: Final answer
    x = 958.18

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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.