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Finding the Fourth Proportional to 987.78, 1,362.84 and 589.32

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Solution

The fourth proportional to 987.78, 1,362.84 and 589.32 is: 813.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.78 : 1,362.84 = 589.32 : x
  2. Step 2: Convert to fraction form
    987.78/1,362.84 = 589.32/x
  3. Step 3: Cross multiply
    987.78x = 1,362.84 × 589.32
  4. Step 4: Simplify right side
    987.78x = 803,148.87
  5. Step 5: Solve for x
    x = 803,148.87/987.78
  6. Step 6: Final answer
    x = 813.08

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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.