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Finding the Fourth Proportional to 972.28, 1,341.82 and 558.28

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Solution

The fourth proportional to 972.28, 1,341.82 and 558.28 is: 770.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.28 : 1,341.82 = 558.28 : x
  2. Step 2: Convert to fraction form
    972.28/1,341.82 = 558.28/x
  3. Step 3: Cross multiply
    972.28x = 1,341.82 × 558.28
  4. Step 4: Simplify right side
    972.28x = 749,111.27
  5. Step 5: Solve for x
    x = 749,111.27/972.28
  6. Step 6: Final answer
    x = 770.47

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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.