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Finding the Fourth Proportional to 1,108.10, 1,528.87 and 715.35

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Solution

The fourth proportional to 1,108.10, 1,528.87 and 715.35 is: 986.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.10 : 1,528.87 = 715.35 : x
  2. Step 2: Convert to fraction form
    1,108.10/1,528.87 = 715.35/x
  3. Step 3: Cross multiply
    1,108.10x = 1,528.87 × 715.35
  4. Step 4: Simplify right side
    1,108.10x = 1,093,677.15
  5. Step 5: Solve for x
    x = 1,093,677.15/1,108.10
  6. Step 6: Final answer
    x = 986.98

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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.