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Finding the Fourth Proportional to 716.54, 987.78 and 569.23

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Solution

The fourth proportional to 716.54, 987.78 and 569.23 is: 784.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.54 : 987.78 = 569.23 : x
  2. Step 2: Convert to fraction form
    716.54/987.78 = 569.23/x
  3. Step 3: Cross multiply
    716.54x = 987.78 × 569.23
  4. Step 4: Simplify right side
    716.54x = 562,271.54
  5. Step 5: Solve for x
    x = 562,271.54/716.54
  6. Step 6: Final answer
    x = 784.70

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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.