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Finding the Fourth Proportional to 928.61, 1,393.62 and 442.01

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Solution

The fourth proportional to 928.61, 1,393.62 and 442.01 is: 663.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.61 : 1,393.62 = 442.01 : x
  2. Step 2: Convert to fraction form
    928.61/1,393.62 = 442.01/x
  3. Step 3: Cross multiply
    928.61x = 1,393.62 × 442.01
  4. Step 4: Simplify right side
    928.61x = 615,987.01
  5. Step 5: Solve for x
    x = 615,987.01/928.61
  6. Step 6: Final answer
    x = 663.35

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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.