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Finding the Fourth Proportional to 948.47, 1,421.49 and 639.59

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Solution

The fourth proportional to 948.47, 1,421.49 and 639.59 is: 958.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.47 : 1,421.49 = 639.59 : x
  2. Step 2: Convert to fraction form
    948.47/1,421.49 = 639.59/x
  3. Step 3: Cross multiply
    948.47x = 1,421.49 × 639.59
  4. Step 4: Simplify right side
    948.47x = 909,170.79
  5. Step 5: Solve for x
    x = 909,170.79/948.47
  6. Step 6: Final answer
    x = 958.57

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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.