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Finding the Fourth Proportional to 988.08, 1,363.59 and 615.09

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Solution

The fourth proportional to 988.08, 1,363.59 and 615.09 is: 848.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.08 : 1,363.59 = 615.09 : x
  2. Step 2: Convert to fraction form
    988.08/1,363.59 = 615.09/x
  3. Step 3: Cross multiply
    988.08x = 1,363.59 × 615.09
  4. Step 4: Simplify right side
    988.08x = 838,730.57
  5. Step 5: Solve for x
    x = 838,730.57/988.08
  6. Step 6: Final answer
    x = 848.85

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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.