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Finding the Fourth Proportional to 970.89, 1,339.78 and 551.23

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Solution

The fourth proportional to 970.89, 1,339.78 and 551.23 is: 760.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.89 : 1,339.78 = 551.23 : x
  2. Step 2: Convert to fraction form
    970.89/1,339.78 = 551.23/x
  3. Step 3: Cross multiply
    970.89x = 1,339.78 × 551.23
  4. Step 4: Simplify right side
    970.89x = 738,530.77
  5. Step 5: Solve for x
    x = 738,530.77/970.89
  6. Step 6: Final answer
    x = 760.67

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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.