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Finding the Fourth Proportional to 660.86, 912.40 and 451.39

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Solution

The fourth proportional to 660.86, 912.40 and 451.39 is: 623.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.86 : 912.40 = 451.39 : x
  2. Step 2: Convert to fraction form
    660.86/912.40 = 451.39/x
  3. Step 3: Cross multiply
    660.86x = 912.40 × 451.39
  4. Step 4: Simplify right side
    660.86x = 411,848.24
  5. Step 5: Solve for x
    x = 411,848.24/660.86
  6. Step 6: Final answer
    x = 623.20

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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.