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Finding the Fourth Proportional to 988.81, 1,364.62 and 569.28

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Solution

The fourth proportional to 988.81, 1,364.62 and 569.28 is: 785.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.81 : 1,364.62 = 569.28 : x
  2. Step 2: Convert to fraction form
    988.81/1,364.62 = 569.28/x
  3. Step 3: Cross multiply
    988.81x = 1,364.62 × 569.28
  4. Step 4: Simplify right side
    988.81x = 776,849.56
  5. Step 5: Solve for x
    x = 776,849.56/988.81
  6. Step 6: Final answer
    x = 785.64

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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.