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Finding the Fourth Proportional to 794.40, 1,097.76 and 715.68

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Solution

The fourth proportional to 794.40, 1,097.76 and 715.68 is: 988.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    794.40 : 1,097.76 = 715.68 : x
  2. Step 2: Convert to fraction form
    794.40/1,097.76 = 715.68/x
  3. Step 3: Cross multiply
    794.40x = 1,097.76 × 715.68
  4. Step 4: Simplify right side
    794.40x = 785,644.88
  5. Step 5: Solve for x
    x = 785,644.88/794.40
  6. Step 6: Final answer
    x = 988.98

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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.