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Finding the Fourth Proportional to 949.58, 1,421.40 and 615.58

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Solution

The fourth proportional to 949.58, 1,421.40 and 615.58 is: 921.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.58 : 1,421.40 = 615.58 : x
  2. Step 2: Convert to fraction form
    949.58/1,421.40 = 615.58/x
  3. Step 3: Cross multiply
    949.58x = 1,421.40 × 615.58
  4. Step 4: Simplify right side
    949.58x = 874,985.41
  5. Step 5: Solve for x
    x = 874,985.41/949.58
  6. Step 6: Final answer
    x = 921.44

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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.