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Finding the Fourth Proportional to 926.72, 1,389.53 and 439.77

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Solution

The fourth proportional to 926.72, 1,389.53 and 439.77 is: 659.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.72 : 1,389.53 = 439.77 : x
  2. Step 2: Convert to fraction form
    926.72/1,389.53 = 439.77/x
  3. Step 3: Cross multiply
    926.72x = 1,389.53 × 439.77
  4. Step 4: Simplify right side
    926.72x = 611,071.41
  5. Step 5: Solve for x
    x = 611,071.41/926.72
  6. Step 6: Final answer
    x = 659.40

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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.