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Finding the Fourth Proportional to 921.74, 1,271.30 and 589.91

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Solution

The fourth proportional to 921.74, 1,271.30 and 589.91 is: 813.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.74 : 1,271.30 = 589.91 : x
  2. Step 2: Convert to fraction form
    921.74/1,271.30 = 589.91/x
  3. Step 3: Cross multiply
    921.74x = 1,271.30 × 589.91
  4. Step 4: Simplify right side
    921.74x = 749,943.28
  5. Step 5: Solve for x
    x = 749,943.28/921.74
  6. Step 6: Final answer
    x = 813.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.