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Finding the Fourth Proportional to 970.92, 1,340.80 and 677

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Solution

The fourth proportional to 970.92, 1,340.80 and 677 is: 934.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.92 : 1,340.80 = 677 : x
  2. Step 2: Convert to fraction form
    970.92/1,340.80 = 677/x
  3. Step 3: Cross multiply
    970.92x = 1,340.80 × 677
  4. Step 4: Simplify right side
    970.92x = 907,721.60
  5. Step 5: Solve for x
    x = 907,721.60/970.92
  6. Step 6: Final answer
    x = 934.91

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Double scale
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1.5x scale

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.