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Finding the Fourth Proportional to 669.54, 917.95 and 657.21

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Solution

The fourth proportional to 669.54, 917.95 and 657.21 is: 901.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.54 : 917.95 = 657.21 : x
  2. Step 2: Convert to fraction form
    669.54/917.95 = 657.21/x
  3. Step 3: Cross multiply
    669.54x = 917.95 × 657.21
  4. Step 4: Simplify right side
    669.54x = 603,285.92
  5. Step 5: Solve for x
    x = 603,285.92/669.54
  6. Step 6: Final answer
    x = 901.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.