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Finding the Fourth Proportional to 970.50, 1,339.56 and 660

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Solution

The fourth proportional to 970.50, 1,339.56 and 660 is: 910.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.50 : 1,339.56 = 660 : x
  2. Step 2: Convert to fraction form
    970.50/1,339.56 = 660/x
  3. Step 3: Cross multiply
    970.50x = 1,339.56 × 660
  4. Step 4: Simplify right side
    970.50x = 884,109.60
  5. Step 5: Solve for x
    x = 884,109.60/970.50
  6. Step 6: Final answer
    x = 910.98

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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.