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Finding the Fourth Proportional to 651.55, 972.68 and 628.77

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Solution

The fourth proportional to 651.55, 972.68 and 628.77 is: 938.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.55 : 972.68 = 628.77 : x
  2. Step 2: Convert to fraction form
    651.55/972.68 = 628.77/x
  3. Step 3: Cross multiply
    651.55x = 972.68 × 628.77
  4. Step 4: Simplify right side
    651.55x = 611,592.00
  5. Step 5: Solve for x
    x = 611,592.00/651.55
  6. Step 6: Final answer
    x = 938.67

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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.