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Finding the Fourth Proportional to 970.37, 1,339.66 and 672.05

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Solution

The fourth proportional to 970.37, 1,339.66 and 672.05 is: 927.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.37 : 1,339.66 = 672.05 : x
  2. Step 2: Convert to fraction form
    970.37/1,339.66 = 672.05/x
  3. Step 3: Cross multiply
    970.37x = 1,339.66 × 672.05
  4. Step 4: Simplify right side
    970.37x = 900,320.17
  5. Step 5: Solve for x
    x = 900,320.17/970.37
  6. Step 6: Final answer
    x = 927.81

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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.