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Finding the Fourth Proportional to 708.30, 1,057.32 and 657.63

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Solution

The fourth proportional to 708.30, 1,057.32 and 657.63 is: 981.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.30 : 1,057.32 = 657.63 : x
  2. Step 2: Convert to fraction form
    708.30/1,057.32 = 657.63/x
  3. Step 3: Cross multiply
    708.30x = 1,057.32 × 657.63
  4. Step 4: Simplify right side
    708.30x = 695,325.35
  5. Step 5: Solve for x
    x = 695,325.35/708.30
  6. Step 6: Final answer
    x = 981.68

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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.