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Finding the Fourth Proportional to 788.45, 1,088.39 and 561.47

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Solution

The fourth proportional to 788.45, 1,088.39 and 561.47 is: 775.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.45 : 1,088.39 = 561.47 : x
  2. Step 2: Convert to fraction form
    788.45/1,088.39 = 561.47/x
  3. Step 3: Cross multiply
    788.45x = 1,088.39 × 561.47
  4. Step 4: Simplify right side
    788.45x = 611,102.46
  5. Step 5: Solve for x
    x = 611,102.46/788.45
  6. Step 6: Final answer
    x = 775.07

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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.