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Finding the Fourth Proportional to 972.59, 1,342.20 and 558.67

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Solution

The fourth proportional to 972.59, 1,342.20 and 558.67 is: 770.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.59 : 1,342.20 = 558.67 : x
  2. Step 2: Convert to fraction form
    972.59/1,342.20 = 558.67/x
  3. Step 3: Cross multiply
    972.59x = 1,342.20 × 558.67
  4. Step 4: Simplify right side
    972.59x = 749,846.87
  5. Step 5: Solve for x
    x = 749,846.87/972.59
  6. Step 6: Final answer
    x = 770.98

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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.