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Finding the Fourth Proportional to 803.39, 1,108.89 and 715.50

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Solution

The fourth proportional to 803.39, 1,108.89 and 715.50 is: 987.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.39 : 1,108.89 = 715.50 : x
  2. Step 2: Convert to fraction form
    803.39/1,108.89 = 715.50/x
  3. Step 3: Cross multiply
    803.39x = 1,108.89 × 715.50
  4. Step 4: Simplify right side
    803.39x = 793,410.80
  5. Step 5: Solve for x
    x = 793,410.80/803.39
  6. Step 6: Final answer
    x = 987.58

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1.5x scale

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.