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Finding the Fourth Proportional to 970, 1,339.08 and 912.40

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Solution

The fourth proportional to 970, 1,339.08 and 912.40 is: 1,259.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    970 : 1,339.08 = 912.40 : x
  2. Step 2: Convert to fraction form
    970/1,339.08 = 912.40/x
  3. Step 3: Cross multiply
    970x = 1,339.08 × 912.40
  4. Step 4: Simplify right side
    970x = 1,221,776.59
  5. Step 5: Solve for x
    x = 1,221,776.59/970
  6. Step 6: Final answer
    x = 1,259.56

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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.