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Finding the Fourth Proportional to 788.99, 1,088.69 and 490.30

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Solution

The fourth proportional to 788.99, 1,088.69 and 490.30 is: 676.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.99 : 1,088.69 = 490.30 : x
  2. Step 2: Convert to fraction form
    788.99/1,088.69 = 490.30/x
  3. Step 3: Cross multiply
    788.99x = 1,088.69 × 490.30
  4. Step 4: Simplify right side
    788.99x = 533,785.93
  5. Step 5: Solve for x
    x = 533,785.93/788.99
  6. Step 6: Final answer
    x = 676.55

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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.