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Finding the Fourth Proportional to 788.38, 1,087.86 and 473.58

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Solution

The fourth proportional to 788.38, 1,087.86 and 473.58 is: 653.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.38 : 1,087.86 = 473.58 : x
  2. Step 2: Convert to fraction form
    788.38/1,087.86 = 473.58/x
  3. Step 3: Cross multiply
    788.38x = 1,087.86 × 473.58
  4. Step 4: Simplify right side
    788.38x = 515,188.74
  5. Step 5: Solve for x
    x = 515,188.74/788.38
  6. Step 6: Final answer
    x = 653.48

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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.