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Finding the Fourth Proportional to 789.09, 1,088.95 and 457.58

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Solution

The fourth proportional to 789.09, 1,088.95 and 457.58 is: 631.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.09 : 1,088.95 = 457.58 : x
  2. Step 2: Convert to fraction form
    789.09/1,088.95 = 457.58/x
  3. Step 3: Cross multiply
    789.09x = 1,088.95 × 457.58
  4. Step 4: Simplify right side
    789.09x = 498,279.45
  5. Step 5: Solve for x
    x = 498,279.45/789.09
  6. Step 6: Final answer
    x = 631.46

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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.