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Finding the Fourth Proportional to 920.71, 1,270.58 and 589.49

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Solution

The fourth proportional to 920.71, 1,270.58 and 589.49 is: 813.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.71 : 1,270.58 = 589.49 : x
  2. Step 2: Convert to fraction form
    920.71/1,270.58 = 589.49/x
  3. Step 3: Cross multiply
    920.71x = 1,270.58 × 589.49
  4. Step 4: Simplify right side
    920.71x = 748,994.20
  5. Step 5: Solve for x
    x = 748,994.20/920.71
  6. Step 6: Final answer
    x = 813.50

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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.