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Finding the Fourth Proportional to 675.74, 930.51 and 660.40

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Solution

The fourth proportional to 675.74, 930.51 and 660.40 is: 909.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.74 : 930.51 = 660.40 : x
  2. Step 2: Convert to fraction form
    675.74/930.51 = 660.40/x
  3. Step 3: Cross multiply
    675.74x = 930.51 × 660.40
  4. Step 4: Simplify right side
    675.74x = 614,513.57
  5. Step 5: Solve for x
    x = 614,513.57/675.74
  6. Step 6: Final answer
    x = 909.39

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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.