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Finding the Fourth Proportional to 651.72, 971.55 and 641.73

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Solution

The fourth proportional to 651.72, 971.55 and 641.73 is: 956.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.72 : 971.55 = 641.73 : x
  2. Step 2: Convert to fraction form
    651.72/971.55 = 641.73/x
  3. Step 3: Cross multiply
    651.72x = 971.55 × 641.73
  4. Step 4: Simplify right side
    651.72x = 623,472.78
  5. Step 5: Solve for x
    x = 623,472.78/651.72
  6. Step 6: Final answer
    x = 956.66

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.