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Finding the Fourth Proportional to 970.78, 1,339.70 and 551.15

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Solution

The fourth proportional to 970.78, 1,339.70 and 551.15 is: 760.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.78 : 1,339.70 = 551.15 : x
  2. Step 2: Convert to fraction form
    970.78/1,339.70 = 551.15/x
  3. Step 3: Cross multiply
    970.78x = 1,339.70 × 551.15
  4. Step 4: Simplify right side
    970.78x = 738,375.66
  5. Step 5: Solve for x
    x = 738,375.66/970.78
  6. Step 6: Final answer
    x = 760.60

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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.